399391516799 has 16 divisors (see below), whose sum is σ = 436772044800. Its totient is φ = 362190660000.

The previous prime is 399391516763. The next prime is 399391516813. The reversal of 399391516799 is 997615193993.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399391516799 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 (399391516709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8548994 + ... + 8595584.

It is an arithmetic number, because the mean of its divisors is an integer number (27298252800).

Almost surely, 2^399391516799 is an apocalyptic number.

399391516799 is a deficient number, since it is larger than the sum of its proper divisors (37380528001).

399391516799 is a wasteful number, since it uses less digits than its factorization.

399391516799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48502.

The product of its digits is 111602610, while the sum is 71.

The spelling of 399391516799 in words is "three hundred ninety-nine billion, three hundred ninety-one million, five hundred sixteen thousand, seven hundred ninety-nine".