399059661 has 32 divisors (see below), whose sum is σ = 714405888. Its totient is φ = 191355840.

The previous prime is 399059659. The next prime is 399059669. The reversal of 399059661 is 166950993.

It is not a de Polignac number, because 399059661 - 2¹ = 399059659 is a prime.

It is a super-2 number, since 2×399059661² = 318497226074869842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399059661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399059669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63441 + ... + 69446.

It is an arithmetic number, because the mean of its divisors is an integer number (22325184).

Almost surely, 2^399059661 is an apocalyptic number.

It is an amenable number.

399059661 is a deficient number, since it is larger than the sum of its proper divisors (315346227).

399059661 is a wasteful number, since it uses less digits than its factorization.

399059661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132921.

The product of its (nonzero) digits is 393660, while the sum is 48.

The square root of 399059661 is about 19976.4776925263. The cubic root of 399059661 is about 736.2284736150.

The spelling of 399059661 in words is "three hundred ninety-nine million, fifty-nine thousand, six hundred sixty-one".