399785038642 has 16 divisors (see below), whose sum is σ = 654252632352. Its totient is φ = 181704101920.

The previous prime is 399785038633. The next prime is 399785038651. The reversal of 399785038642 is 246830587993.

It is an interprime number because it is at equal distance from previous prime (399785038633) and next prime (399785038651).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 567028 + ... + 1058815.

It is an arithmetic number, because the mean of its divisors is an integer number (40890789522).

Almost surely, 2^399785038642 is an apocalyptic number.

399785038642 is a deficient number, since it is larger than the sum of its proper divisors (254467593710).

399785038642 is a wasteful number, since it uses less digits than its factorization.

399785038642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637033.

The product of its (nonzero) digits is 78382080, while the sum is 64.

The spelling of 399785038642 in words is "three hundred ninety-nine billion, seven hundred eighty-five million, thirty-eight thousand, six hundred forty-two".