399705252685 has 16 divisors (see below), whose sum is σ = 485330123520. Its totient is φ = 315995417920.

The previous prime is 399705252647. The next prime is 399705252707. The reversal of 399705252685 is 586252507993.

It is not a de Polignac number, because 399705252685 - 2³³ = 391115318093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1120102 + ... + 1433191.

It is an arithmetic number, because the mean of its divisors is an integer number (30333132720).

Almost surely, 2^399705252685 is an apocalyptic number.

It is an amenable number.

399705252685 is a deficient number, since it is larger than the sum of its proper divisors (85624870835).

399705252685 is a wasteful number, since it uses less digits than its factorization.

399705252685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2553668.

The product of its (nonzero) digits is 40824000, while the sum is 61.

The spelling of 399705252685 in words is "three hundred ninety-nine billion, seven hundred five million, two hundred fifty-two thousand, six hundred eighty-five".