394997684958 has 24 divisors (see below), whose sum is σ = 855863738496. Its totient is φ = 131660445600.

The previous prime is 394997684951. The next prime is 394997685011. The reversal of 394997684958 is 859486799493.

394997684958 is a `hidden beast` number, since 3 + 9 + 499 + 76 + 8 + 4 + 9 + 58 = 666.

It is a super-2 number, since 2×394997684958² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394997684951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5443 + ... + 888833.

It is an arithmetic number, because the mean of its divisors is an integer number (35660989104).

Almost surely, 2^394997684958 is an apocalyptic number.

394997684958 is an abundant number, since it is smaller than the sum of its proper divisors (460866053538).

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

394997684958 is a wasteful number, since it uses less digits than its factorization.

394997684958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908240 (or 908237 counting only the distinct ones).

The product of its digits is 4232632320, while the sum is 81.

The spelling of 394997684958 in words is "three hundred ninety-four billion, nine hundred ninety-seven million, six hundred eighty-four thousand, nine hundred fifty-eight".