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122400031 = 139415387
BaseRepresentation
bin1110100101110…
…10110100011111
322112022120021111
413102322310133
5222313300111
620051242451
73014245255
oct722726437
9275276244
10122400031
1163100a56
1234ba9427
131c487470
14123825d5
15ab2ba21
hex74bad1f

122400031 has 4 divisors (see below), whose sum is σ = 131815432. Its totient is φ = 112984632.

The previous prime is 122400029. The next prime is 122400041. The reversal of 122400031 is 130004221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 122400031 - 21 = 122400029 is a prime.

It is a super-2 number, since 2×1224000312 = 29963535177601922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 9415387 = 122400031 / (1 + 2 + 2 + 4 + 0 + 0 + 0 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122399984 and 122400020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122400041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4707681 + ... + 4707706.

It is an arithmetic number, because the mean of its divisors is an integer number (32953858).

Almost surely, 2122400031 is an apocalyptic number.

122400031 is a deficient number, since it is larger than the sum of its proper divisors (9415401).

122400031 is an equidigital number, since it uses as much as digits as its factorization.

122400031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9415400.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 122400031 is about 11063.4547497606. The cubic root of 122400031 is about 496.5090580391.

Adding to 122400031 its reverse (130004221), we get a palindrome (252404252).

The spelling of 122400031 in words is "one hundred twenty-two million, four hundred thousand, thirty-one".

Divisors: 1 13 9415387 122400031