399071560 has 16 divisors (see below), whose sum is σ = 897911100. Its totient is φ = 159628608.

The previous prime is 399071539. The next prime is 399071579. The reversal of 399071560 is 65170993.

It can be written as a sum of positive squares in 2 ways, for example, as 375041956 + 24029604 = 19366^2 + 4902^2 .

It is a super-2 number, since 2×399071560² = 318516220001667200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 9976789 = 399071560 / (3 + 9 + 9 + 0 + 7 + 1 + 5 + 6 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4988355 + ... + 4988434.

Almost surely, 2^399071560 is an apocalyptic number.

It is an amenable number.

399071560 is an abundant number, since it is smaller than the sum of its proper divisors (498839540).

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

399071560 is a wasteful number, since it uses less digits than its factorization.

399071560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9976800 (or 9976796 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 399071560 is about 19976.7755155831. The cubic root of 399071560 is about 736.2357910635.

The spelling of 399071560 in words is "three hundred ninety-nine million, seventy-one thousand, five hundred sixty".