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1223221 = 4328447
BaseRepresentation
bin100101010101000110101
32022010221111
410222220311
5303120341
642115021
713253146
oct4525065
92263844
101223221
1176602a
124aba71
1333a9cc
1423bacd
15192681
hex12aa35

1223221 has 4 divisors (see below), whose sum is σ = 1251712. Its totient is φ = 1194732.

The previous prime is 1223207. The next prime is 1223231.

1223221 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1223221 - 27 = 1223093 is a prime.

It is a super-2 number, since 2×12232212 = 2992539229682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223231) 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, 14181 + ... + 14266.

It is an arithmetic number, because the mean of its divisors is an integer number (312928).

21223221 is an apocalyptic number.

It is an amenable number.

1223221 is a deficient number, since it is larger than the sum of its proper divisors (28491).

1223221 is an equidigital number, since it uses as much as digits as its factorization.

1223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28490.

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

The square root of 1223221 is about 1105.9932187857. The cubic root of 1223221 is about 106.9469268341.

It can be divided in two parts, 1223 and 221, that added together give a square (1444 = 382).

The spelling of 1223221 in words is "one million, two hundred twenty-three thousand, two hundred twenty-one".

Divisors: 1 43 28447 1223221