399543868 has 6 divisors (see below), whose sum is σ = 699201776. Its totient is φ = 199771932.

The previous prime is 399543863. The next prime is 399543869. The reversal of 399543868 is 868345993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399543863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49942980 + ... + 49942987.

Almost surely, 2^399543868 is an apocalyptic number.

It is an amenable number.

399543868 is a deficient number, since it is larger than the sum of its proper divisors (299657908).

399543868 is a wasteful number, since it uses less digits than its factorization.

399543868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99885971 (or 99885969 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 55.

The square root of 399543868 is about 19988.5934472639. The cubic root of 399543868 is about 736.5261257616.

The spelling of 399543868 in words is "three hundred ninety-nine million, five hundred forty-three thousand, eight hundred sixty-eight".