394639883964 has 72 divisors (see below), whose sum is σ = 1010177532000. Its totient is φ = 129889308672.

The previous prime is 394639883899. The next prime is 394639883977. The reversal of 394639883964 is 469388936493.

394639883964 is a `hidden beast` number, since 3 + 94 + 63 + 98 + 8 + 396 + 4 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 394639883892 and 394639883901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1381537 + ... + 1642535.

It is an arithmetic number, because the mean of its divisors is an integer number (14030243500).

Almost surely, 2^394639883964 is an apocalyptic number.

It is an amenable number.

394639883964 is an abundant number, since it is smaller than the sum of its proper divisors (615537648036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

394639883964 is a wasteful number, since it uses less digits than its factorization.

394639883964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261539 (or 261534 counting only the distinct ones).

The product of its digits is 725594112, while the sum is 72.

The spelling of 394639883964 in words is "three hundred ninety-four billion, six hundred thirty-nine million, eight hundred eighty-three thousand, nine hundred sixty-four".