399816087 has 8 divisors (see below), whose sum is σ = 581550720. Its totient is φ = 242312760.

The previous prime is 399816049. The next prime is 399816097. The reversal of 399816087 is 780618993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399816087 - 2¹⁶ = 399750551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399816007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6057787 + ... + 6057852.

It is an arithmetic number, because the mean of its divisors is an integer number (72693840).

Almost surely, 2^399816087 is an apocalyptic number.

399816087 is a deficient number, since it is larger than the sum of its proper divisors (181734633).

399816087 is a wasteful number, since it uses less digits than its factorization.

399816087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12115653.

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 399816087 is about 19995.4016463786. The cubic root of 399816087 is about 736.6933588694.

The spelling of 399816087 in words is "three hundred ninety-nine million, eight hundred sixteen thousand, eighty-seven".