399906807 has 8 divisors (see below), whose sum is σ = 534072960. Its totient is φ = 266172600.

The previous prime is 399906803. The next prime is 399906809. The reversal of 399906807 is 708609993.

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

It is not a de Polignac number, because 399906807 - 2² = 399906803 is a prime.

It is a super-3 number, since 3×399906807³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399906807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399906803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105819 + ... + 109532.

It is an arithmetic number, because the mean of its divisors is an integer number (66759120).

Almost surely, 2^399906807 is an apocalyptic number.

399906807 is a deficient number, since it is larger than the sum of its proper divisors (134166153).

399906807 is a wasteful number, since it uses less digits than its factorization.

399906807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215973.

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 399906807 is about 19997.6700392821. The cubic root of 399906807 is about 736.7490742924.

The spelling of 399906807 in words is "three hundred ninety-nine million, nine hundred six thousand, eight hundred seven".