399766905 has 24 divisors (see below), whose sum is σ = 695048640. Its totient is φ = 212556960.

The previous prime is 399766891. The next prime is 399766909. The reversal of 399766905 is 509667993.

It is not a de Polignac number, because 399766905 - 2⁴ = 399766889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399766909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1476 + ... + 28314.

It is an arithmetic number, because the mean of its divisors is an integer number (28960360).

Almost surely, 2^399766905 is an apocalyptic number.

It is an amenable number.

399766905 is a deficient number, since it is larger than the sum of its proper divisors (295281735).

399766905 is a wasteful number, since it uses less digits than its factorization.

399766905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27181 (or 27178 counting only the distinct ones).

The product of its (nonzero) digits is 2755620, while the sum is 54.

The square root of 399766905 is about 19994.1717757951. The cubic root of 399766905 is about 736.6631503646.

The spelling of 399766905 in words is "three hundred ninety-nine million, seven hundred sixty-six thousand, nine hundred five".