338372721 has 20 divisors (see below), whose sum is σ = 511878400. Its totient is φ = 222722136.

The previous prime is 338372717. The next prime is 338372731. The reversal of 338372721 is 127273833.

338372721 is a `hidden beast` number, since 3 + 383 + 7 + 272 + 1 = 666.

It is not a de Polignac number, because 338372721 - 2² = 338372717 is a prime.

It is a super-2 number, since 2×338372721² = 228992196633887682, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (338372701) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20041 + ... + 32838.

It is an arithmetic number, because the mean of its divisors is an integer number (25593920).

Almost surely, 2^338372721 is an apocalyptic number.

It is an amenable number.

338372721 is a deficient number, since it is larger than the sum of its proper divisors (173505679).

338372721 is an equidigital number, since it uses as much as digits as its factorization.

338372721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52970 (or 52961 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 338372721 is about 18394.9101927680. The cubic root of 338372721 is about 696.8379288155.

The spelling of 338372721 in words is "three hundred thirty-eight million, three hundred seventy-two thousand, seven hundred twenty-one".