399720795 has 16 divisors (see below), whose sum is σ = 667360512. Its totient is φ = 203915360.

The previous prime is 399720781. The next prime is 399720799. The reversal of 399720795 is 597027993.

It is a happy number.

It is not a de Polignac number, because 399720795 - 2⁷ = 399720667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399720799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 578961 + ... + 579650.

It is an arithmetic number, because the mean of its divisors is an integer number (41710032).

Almost surely, 2^399720795 is an apocalyptic number.

399720795 is a deficient number, since it is larger than the sum of its proper divisors (267639717).

399720795 is a wasteful number, since it uses less digits than its factorization.

399720795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158642.

The product of its (nonzero) digits is 1071630, while the sum is 51.

The square root of 399720795 is about 19993.0186565211. The cubic root of 399720795 is about 736.6348264893.

The spelling of 399720795 in words is "three hundred ninety-nine million, seven hundred twenty thousand, seven hundred ninety-five".