399945175 has 12 divisors (see below), whose sum is σ = 566779696. Its totient is φ = 274248000.

The previous prime is 399945151. The next prime is 399945191. The reversal of 399945175 is 571549993.

It is a happy number.

It is not a de Polignac number, because 399945175 - 2⁷ = 399945047 is a prime.

It is a super-2 number, since 2×399945175² = 319912286011561250, which contains 22 as substring.

It is a congruent 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, 1142526 + ... + 1142875.

Almost surely, 2^399945175 is an apocalyptic number.

399945175 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

399945175 is a deficient number, since it is larger than the sum of its proper divisors (166834521).

399945175 is a wasteful number, since it uses less digits than its factorization.

399945175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285418 (or 2285413 counting only the distinct ones).

The product of its digits is 1530900, while the sum is 52.

The square root of 399945175 is about 19998.6293280315. The cubic root of 399945175 is about 736.7726353522.

The spelling of 399945175 in words is "three hundred ninety-nine million, nine hundred forty-five thousand, one hundred seventy-five".