338856921 has 12 divisors (see below), whose sum is σ = 527110948. Its totient is φ = 208527264.

The previous prime is 338856901. The next prime is 338856929. The reversal of 338856921 is 129658833.

It is a happy number.

338856921 is a `hidden beast` number, since 3 + 3 + 88 + 569 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 54597321 + 284259600 = 7389^2 + 16860^2 .

It is not a de Polignac number, because 338856921 - 2⁹ = 338856409 is a prime.

It is a super-2 number, since 2×338856921² = 229648025819200482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (338856929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1447990 + ... + 1448223.

Almost surely, 2^338856921 is an apocalyptic number.

It is an amenable number.

338856921 is a deficient number, since it is larger than the sum of its proper divisors (188254027).

338856921 is a wasteful number, since it uses less digits than its factorization.

338856921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896232 (or 2896229 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 338856921 is about 18408.0667371672. The cubic root of 338856921 is about 697.1701542893.

The spelling of 338856921 in words is "three hundred thirty-eight million, eight hundred fifty-six thousand, nine hundred twenty-one".