399713892721 has 48 divisors (see below), whose sum is σ = 480163622400. Its totient is φ = 330463584000.

The previous prime is 399713892701. The next prime is 399713892761. The reversal of 399713892721 is 127298317993.

It is not a de Polignac number, because 399713892721 - 2¹³ = 399713884529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399713892721.

It is not an unprimeable number, because it can be changed into a prime (399713892701) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 166615680 + ... + 166618078.

It is an arithmetic number, because the mean of its divisors is an integer number (10003408800).

Almost surely, 2^399713892721 is an apocalyptic number.

It is an amenable number.

399713892721 is a deficient number, since it is larger than the sum of its proper divisors (80449729679).

399713892721 is a wasteful number, since it uses less digits than its factorization.

399713892721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3958 (or 3947 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 61.

The spelling of 399713892721 in words is "three hundred ninety-nine billion, seven hundred thirteen million, eight hundred ninety-two thousand, seven hundred twenty-one".