399042660 has 48 divisors (see below), whose sum is σ = 1118678400. Its totient is φ = 106281984.

The previous prime is 399042607. The next prime is 399042689. The reversal of 399042660 is 66240993.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52161 + ... + 59319.

It is an arithmetic number, because the mean of its divisors is an integer number (23305800).

Almost surely, 2^399042660 is an apocalyptic number.

399042660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399042660 is an abundant number, since it is smaller than the sum of its proper divisors (719635740).

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

399042660 is a wasteful number, since it uses less digits than its factorization.

399042660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8100 (or 8098 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 399042660 is about 19976.0521625270. The cubic root of 399042660 is about 736.2180183713.

The spelling of 399042660 in words is "three hundred ninety-nine million, forty-two thousand, six hundred sixty".