399166275 has 12 divisors (see below), whose sum is σ = 659955032. Its totient is φ = 212888640.

The previous prime is 399166259. The next prime is 399166297. The reversal of 399166275 is 572661993.

It is not a de Polignac number, because 399166275 - 2⁴ = 399166259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2661034 + ... + 2661183.

Almost surely, 2^399166275 is an apocalyptic number.

399166275 is a deficient number, since it is larger than the sum of its proper divisors (260788757).

399166275 is a wasteful number, since it uses less digits than its factorization.

399166275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5322230 (or 5322225 counting only the distinct ones).

The product of its digits is 612360, while the sum is 48.

The square root of 399166275 is about 19979.1460027700. The cubic root of 399166275 is about 736.2940321276.

The spelling of 399166275 in words is "three hundred ninety-nine million, one hundred sixty-six thousand, two hundred seventy-five".