399032678 has 8 divisors (see below), whose sum is σ = 652962600. Its totient is φ = 181378480.

The previous prime is 399032677. The next prime is 399032723. The reversal of 399032678 is 876230993.

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

It is a super-2 number, since 2×399032678² = 318454156223703368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399032677) 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, 9068903 + ... + 9068946.

It is an arithmetic number, because the mean of its divisors is an integer number (81620325).

Almost surely, 2^399032678 is an apocalyptic number.

399032678 is a deficient number, since it is larger than the sum of its proper divisors (253929922).

399032678 is a wasteful number, since it uses less digits than its factorization.

399032678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18137862.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 399032678 is about 19975.8023117971. The cubic root of 399032678 is about 736.2118795209.

The spelling of 399032678 in words is "three hundred ninety-nine million, thirty-two thousand, six hundred seventy-eight".