399244668 has 12 divisors (see below), whose sum is σ = 931570920. Its totient is φ = 133081552.

The previous prime is 399244631. The next prime is 399244669. The reversal of 399244668 is 866442993.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 399244668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399244669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16635183 + ... + 16635206.

It is an arithmetic number, because the mean of its divisors is an integer number (77630910).

Almost surely, 2^399244668 is an apocalyptic number.

It is an amenable number.

399244668 is an abundant number, since it is smaller than the sum of its proper divisors (532326252).

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

399244668 is a wasteful number, since it uses less digits than its factorization.

399244668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33270396 (or 33270394 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 51.

The square root of 399244668 is about 19981.1077770978. The cubic root of 399244668 is about 736.3422296863.

The spelling of 399244668 in words is "three hundred ninety-nine million, two hundred forty-four thousand, six hundred sixty-eight".