399196287 has 18 divisors (see below), whose sum is σ = 670759128. Its totient is φ = 228111912.

The previous prime is 399196277. The next prime is 399196319. The reversal of 399196287 is 782691993.

399196287 is a `hidden beast` number, since 3 + 9 + 9 + 1 + 9 + 628 + 7 = 666.

It is not a de Polignac number, because 399196287 - 2¹² = 399192191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399196247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 452163 + ... + 453044.

It is an arithmetic number, because the mean of its divisors is an integer number (37264396).

Almost surely, 2^399196287 is an apocalyptic number.

399196287 is a deficient number, since it is larger than the sum of its proper divisors (271562841).

399196287 is a wasteful number, since it uses less digits than its factorization.

399196287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905227 (or 905217 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 399196287 is about 19979.8970718070. The cubic root of 399196287 is about 736.3124848411.

The spelling of 399196287 in words is "three hundred ninety-nine million, one hundred ninety-six thousand, two hundred eighty-seven".