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122989 = 294241
BaseRepresentation
bin11110000001101101
320020201011
4132001231
512413424
62345221
71021366
oct360155
9206634
10122989
1184449
125b211
1343c99
1432b6d
1526694
hex1e06d

122989 has 4 divisors (see below), whose sum is σ = 127260. Its totient is φ = 118720.

The previous prime is 122971. The next prime is 123001. The reversal of 122989 is 989221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989221 = 2394139.

It can be written as a sum of positive squares in 2 ways, for example, as 100489 + 22500 = 317^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 122989 - 25 = 122957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2092 + ... + 2149.

It is an arithmetic number, because the mean of its divisors is an integer number (31815).

2122989 is an apocalyptic number.

It is an amenable number.

122989 is a deficient number, since it is larger than the sum of its proper divisors (4271).

122989 is an equidigital number, since it uses as much as digits as its factorization.

122989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4270.

The product of its digits is 2592, while the sum is 31.

The square root of 122989 is about 350.6978756708. The cubic root of 122989 is about 49.7304157658.

It can be divided in two parts, 122 and 989, that added together give a palindrome (1111).

The spelling of 122989 in words is "one hundred twenty-two thousand, nine hundred eighty-nine".

Divisors: 1 29 4241 122989