399140938 has 16 divisors (see below), whose sum is σ = 684650880. Its totient is φ = 170958096.

The previous prime is 399140927. The next prime is 399140969. The reversal of 399140938 is 839041993.

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, 18720 + ... + 33892.

It is an arithmetic number, because the mean of its divisors is an integer number (42790680).

Almost surely, 2^399140938 is an apocalyptic number.

399140938 is a deficient number, since it is larger than the sum of its proper divisors (285509942).

399140938 is a wasteful number, since it uses less digits than its factorization.

399140938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17061.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 399140938 is about 19978.5119065460. The cubic root of 399140938 is about 736.2784530922.

The spelling of 399140938 in words is "three hundred ninety-nine million, one hundred forty thousand, nine hundred thirty-eight".