394906904 has 32 divisors (see below), whose sum is σ = 851316480. Its totient is φ = 168228384.

The previous prime is 394906903. The next prime is 394906913. The reversal of 394906904 is 409609493.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394906903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11762 + ... + 30465.

It is an arithmetic number, because the mean of its divisors is an integer number (26603640).

Almost surely, 2^394906904 is an apocalyptic number.

It is an amenable number.

394906904 is an abundant number, since it is smaller than the sum of its proper divisors (456409576).

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

394906904 is a wasteful number, since it uses less digits than its factorization.

394906904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42407 (or 42403 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 394906904 is about 19872.2646922790. The cubic root of 394906904 is about 733.6657447994.

The spelling of 394906904 in words is "three hundred ninety-four million, nine hundred six thousand, nine hundred four".