399690744 has 32 divisors (see below), whose sum is σ = 1000482000. Its totient is φ = 133062912.

The previous prime is 399690743. The next prime is 399690793. The reversal of 399690744 is 447096993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399690743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9852 + ... + 29940.

Almost surely, 2^399690744 is an apocalyptic number.

It is an amenable number.

399690744 is an abundant number, since it is smaller than the sum of its proper divisors (600791256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399690744 is a wasteful number, since it uses less digits than its factorization.

399690744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20927 (or 20923 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 51.

The square root of 399690744 is about 19992.2671050584. The cubic root of 399690744 is about 736.6163659637.

The spelling of 399690744 in words is "three hundred ninety-nine million, six hundred ninety thousand, seven hundred forty-four".