399313557 has 80 divisors (see below), whose sum is σ = 679536000. Its totient is φ = 232315776.

The previous prime is 399313531. The next prime is 399313559. The reversal of 399313557 is 755313993.

399313557 is a `hidden beast` number, since 3 + 9 + 93 + 1 + 3 + 557 = 666.

It is not a de Polignac number, because 399313557 - 2¹⁰ = 399312533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399313559) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1026319 + ... + 1026707.

It is an arithmetic number, because the mean of its divisors is an integer number (8494200).

Almost surely, 2^399313557 is an apocalyptic number.

It is an amenable number.

399313557 is a deficient number, since it is larger than the sum of its proper divisors (280222443).

399313557 is a wasteful number, since it uses less digits than its factorization.

399313557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 463 counting only the distinct ones).

The product of its digits is 382725, while the sum is 45.

The square root of 399313557 is about 19982.8315561134. The cubic root of 399313557 is about 736.3845787908.

The spelling of 399313557 in words is "three hundred ninety-nine million, three hundred thirteen thousand, five hundred fifty-seven".