336972721 has 6 divisors (see below), whose sum is σ = 348994022. Its totient is φ = 325352160.

The previous prime is 336972719. The next prime is 336972743. The reversal of 336972721 is 127279633.

It can be written as a sum of positive squares in 3 ways, for example, as 66830625 + 270142096 = 8175^2 + 16436^2 .

It is not a de Polignac number, because 336972721 - 2¹ = 336972719 is a prime.

It is a super-2 number, since 2×336972721² = 227101229396287682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (336972121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 199500 + ... + 201181.

Almost surely, 2^336972721 is an apocalyptic number.

It is an amenable number.

336972721 is a deficient number, since it is larger than the sum of its proper divisors (12021301).

336972721 is an equidigital number, since it uses as much as digits as its factorization.

336972721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400739 (or 400710 counting only the distinct ones).

The product of its digits is 95256, while the sum is 40.

The square root of 336972721 is about 18356.8167447409. The cubic root of 336972721 is about 695.8755564547.

The spelling of 336972721 in words is "three hundred thirty-six million, nine hundred seventy-two thousand, seven hundred twenty-one".