399646626 has 8 divisors (see below), whose sum is σ = 799293264. Its totient is φ = 133215540.

The previous prime is 399646609. The next prime is 399646631. The reversal of 399646626 is 626646993.

It is a sphenic number, since it is the product of 3 distinct primes.

399646626 is an admirable 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, 33303880 + ... + 33303891.

It is an arithmetic number, because the mean of its divisors is an integer number (99911658).

Almost surely, 2^399646626 is an apocalyptic number.

399646626 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

399646626 is a wasteful number, since it uses less digits than its factorization.

399646626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66607776.

The product of its digits is 2519424, while the sum is 51.

The square root of 399646626 is about 19991.1636979942. The cubic root of 399646626 is about 736.5892623116.

The spelling of 399646626 in words is "three hundred ninety-nine million, six hundred forty-six thousand, six hundred twenty-six".