399798723 has 16 divisors (see below), whose sum is σ = 555616256. Its totient is φ = 255424320.

The previous prime is 399798713. The next prime is 399798731. The reversal of 399798723 is 327897993.

It is not a de Polignac number, because 399798723 - 2⁹ = 399798211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399798713) 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, 11290 + ... + 30447.

It is an arithmetic number, because the mean of its divisors is an integer number (34726016).

Almost surely, 2^399798723 is an apocalyptic number.

399798723 is a deficient number, since it is larger than the sum of its proper divisors (155817533).

399798723 is a wasteful number, since it uses less digits than its factorization.

399798723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41874.

The product of its digits is 5143824, while the sum is 57.

The square root of 399798723 is about 19994.9674418340. The cubic root of 399798723 is about 736.6826938586.

The spelling of 399798723 in words is "three hundred ninety-nine million, seven hundred ninety-eight thousand, seven hundred twenty-three".