399487738 has 16 divisors (see below), whose sum is σ = 647667720. Its totient is φ = 183710016.

The previous prime is 399487727. The next prime is 399487747. The reversal of 399487738 is 837784993.

It can be written as a sum of positive squares in 4 ways, for example, as 70174129 + 329313609 = 8377^2 + 18147^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20533 + ... + 34936.

Almost surely, 2^399487738 is an apocalyptic number.

399487738 is a deficient number, since it is larger than the sum of its proper divisors (248179982).

399487738 is a wasteful number, since it uses less digits than its factorization.

399487738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55761.

The product of its digits is 9144576, while the sum is 58.

The square root of 399487738 is about 19987.1893471794. The cubic root of 399487738 is about 736.4916338064.

The spelling of 399487738 in words is "three hundred ninety-nine million, four hundred eighty-seven thousand, seven hundred thirty-eight".