338429721 has 12 divisors (see below), whose sum is σ = 524911632. Its totient is φ = 193388328.

The previous prime is 338429717. The next prime is 338429743. The reversal of 338429721 is 127924833.

It is not a de Polignac number, because 338429721 - 2² = 338429717 is a prime.

It is a super-2 number, since 2×338429721² = 229069352112275682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 338429721.

It is not an unprimeable number, because it can be changed into a prime (338429701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1150975 + ... + 1151268.

It is an arithmetic number, because the mean of its divisors is an integer number (43742636).

Almost surely, 2^338429721 is an apocalyptic number.

It is an amenable number.

338429721 is a deficient number, since it is larger than the sum of its proper divisors (186481911).

338429721 is a wasteful number, since it uses less digits than its factorization.

338429721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302260 (or 2302253 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 338429721 is about 18396.4594691479. The cubic root of 338429721 is about 696.8770548338.

The spelling of 338429721 in words is "three hundred thirty-eight million, four hundred twenty-nine thousand, seven hundred twenty-one".