399222670 has 32 divisors (see below), whose sum is σ = 895919616. Its totient is φ = 124432800.

The previous prime is 399222647. The next prime is 399222683. The reversal of 399222670 is 76222993.

It is a congruent 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, 258466 + ... + 260005.

It is an arithmetic number, because the mean of its divisors is an integer number (27997488).

Almost surely, 2^399222670 is an apocalyptic number.

399222670 is an abundant number, since it is smaller than the sum of its proper divisors (496696946).

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

399222670 is a wasteful number, since it uses less digits than its factorization.

399222670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518496.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 399222670 is about 19980.5572995350. The cubic root of 399222670 is about 736.3287055199.

It can be divided in two parts, 3992 and 22670, that added together give a palindrome (26662).

The spelling of 399222670 in words is "three hundred ninety-nine million, two hundred twenty-two thousand, six hundred seventy".