399061556 has 12 divisors (see below), whose sum is σ = 699172992. Its totient is φ = 199297848.

The previous prime is 399061511. The next prime is 399061561. The reversal of 399061556 is 655160993.

It is a super-2 number, since 2×399061556² = 318500250954282272, which contains 22 as substring.

It is a congruent number.

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, 54350 + ... + 61253.

It is an arithmetic number, because the mean of its divisors is an integer number (58264416).

Almost surely, 2^399061556 is an apocalyptic number.

It is an amenable number.

399061556 is a deficient number, since it is larger than the sum of its proper divisors (300111436).

399061556 is a wasteful number, since it uses less digits than its factorization.

399061556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116470 (or 116468 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 399061556 is about 19976.5251232540. The cubic root of 399061556 is about 736.2296389802.

The spelling of 399061556 in words is "three hundred ninety-nine million, sixty-one thousand, five hundred fifty-six".