399080557 has 16 divisors (see below), whose sum is σ = 415872000. Its totient is φ = 382656960.

The previous prime is 399080551. The next prime is 399080569. The reversal of 399080557 is 755080993.

It is not a de Polignac number, because 399080557 - 2¹¹ = 399078509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399080551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1052794 + ... + 1053172.

It is an arithmetic number, because the mean of its divisors is an integer number (25992000).

Almost surely, 2^399080557 is an apocalyptic number.

399080557 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

399080557 is a deficient number, since it is larger than the sum of its proper divisors (16791443).

399080557 is a wasteful number, since it uses less digits than its factorization.

399080557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756.

The product of its (nonzero) digits is 340200, while the sum is 46.

The square root of 399080557 is about 19977.0007008059. Note that the first 3 decimals coincide. The cubic root of 399080557 is about 736.2413237919.

The spelling of 399080557 in words is "three hundred ninety-nine million, eighty thousand, five hundred fifty-seven".