399798907 has 4 divisors (see below), whose sum is σ = 409096600. Its totient is φ = 390501216.

The previous prime is 399798899. The next prime is 399798923. The reversal of 399798907 is 709897993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399798907 - 2³ = 399798899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399798937) 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, 4648782 + ... + 4648867.

It is an arithmetic number, because the mean of its divisors is an integer number (102274150).

Almost surely, 2^399798907 is an apocalyptic number.

399798907 is a deficient number, since it is larger than the sum of its proper divisors (9297693).

399798907 is an equidigital number, since it uses as much as digits as its factorization.

399798907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9297692.

The product of its (nonzero) digits is 7715736, while the sum is 61.

The square root of 399798907 is about 19994.9720429912. The cubic root of 399798907 is about 736.6828068734.

The spelling of 399798907 in words is "three hundred ninety-nine million, seven hundred ninety-eight thousand, nine hundred seven".