399934287 has 16 divisors (see below), whose sum is σ = 623680000. Its totient is φ = 252589752.

The previous prime is 399934259. The next prime is 399934289. The reversal of 399934287 is 782439993.

It is not a de Polignac number, because 399934287 - 2¹⁶ = 399868751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399934289) 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 15 ways as a sum of consecutive naturals, for example, 389287 + ... + 390312.

It is an arithmetic number, because the mean of its divisors is an integer number (38980000).

Almost surely, 2^399934287 is an apocalyptic number.

399934287 is a deficient number, since it is larger than the sum of its proper divisors (223745713).

399934287 is a wasteful number, since it uses less digits than its factorization.

399934287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779627 (or 779621 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 399934287 is about 19998.3571075226. The cubic root of 399934287 is about 736.7659493914.

The spelling of 399934287 in words is "three hundred ninety-nine million, nine hundred thirty-four thousand, two hundred eighty-seven".