394657881982 has 64 divisors (see below), whose sum is σ = 741111436800. Its totient is φ = 153469468800.

The previous prime is 394657881973. The next prime is 394657882079. The reversal of 394657881982 is 289188756493.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2477869 + ... + 2632327.

It is an arithmetic number, because the mean of its divisors is an integer number (11579866200).

Almost surely, 2^394657881982 is an apocalyptic number.

394657881982 is a deficient number, since it is larger than the sum of its proper divisors (346453554818).

394657881982 is a wasteful number, since it uses less digits than its factorization.

394657881982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154721.

The product of its digits is 209018880, while the sum is 70.

The spelling of 394657881982 in words is "three hundred ninety-four billion, six hundred fifty-seven million, eight hundred eighty-one thousand, nine hundred eighty-two".