399106624 has 28 divisors (see below), whose sum is σ = 905117824. Its totient is φ = 171045504.

The previous prime is 399106577. The next prime is 399106627. The reversal of 399106624 is 426601993.

It is a tau number, because it is divible by the number of its divisors (28).

It is not an unprimeable number, because it can be changed into a prime (399106627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444984 + ... + 445879.

Almost surely, 2^399106624 is an apocalyptic number.

It is an amenable number.

399106624 is an abundant number, since it is smaller than the sum of its proper divisors (506011200).

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

399106624 is an equidigital number, since it uses as much as digits as its factorization.

399106624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890882 (or 890872 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 399106624 is about 19977.6531154187. The cubic root of 399106624 is about 736.2573532913.

The spelling of 399106624 in words is "three hundred ninety-nine million, one hundred six thousand, six hundred twenty-four".