399994188 has 24 divisors (see below), whose sum is σ = 1018167360. Its totient is φ = 121210320.

The previous prime is 399994171. The next prime is 399994201. The reversal of 399994188 is 881499993.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1514998 + ... + 1515261.

It is an arithmetic number, because the mean of its divisors is an integer number (42423640).

Almost surely, 2^399994188 is an apocalyptic number.

It is an amenable number.

399994188 is an abundant number, since it is smaller than the sum of its proper divisors (618173172).

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

399994188 is a wasteful number, since it uses less digits than its factorization.

399994188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030277 (or 3030275 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 60.

The square root of 399994188 is about 19999.8546994722. The cubic root of 399994188 is about 736.8027311123.

The spelling of 399994188 in words is "three hundred ninety-nine million, nine hundred ninety-four thousand, one hundred eighty-eight".