399894635 has 24 divisors (see below), whose sum is σ = 559347840. Its totient is φ = 273659904.

The previous prime is 399894623. The next prime is 399894667. The reversal of 399894635 is 536498993.

It is not a de Polignac number, because 399894635 - 2⁶ = 399894571 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147371 + ... + 150059.

It is an arithmetic number, because the mean of its divisors is an integer number (23306160).

Almost surely, 2^399894635 is an apocalyptic number.

399894635 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

399894635 is a deficient number, since it is larger than the sum of its proper divisors (159453205).

399894635 is a wasteful number, since it uses less digits than its factorization.

399894635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315 (or 3308 counting only the distinct ones).

The product of its digits is 6298560, while the sum is 56.

The square root of 399894635 is about 19997.3657015118. The cubic root of 399894635 is about 736.7415993836.

The spelling of 399894635 in words is "three hundred ninety-nine million, eight hundred ninety-four thousand, six hundred thirty-five".