381806904 has 32 divisors (see below), whose sum is σ = 955232640. Its totient is φ = 127173600.

The previous prime is 381806861. The next prime is 381806939. The reversal of 381806904 is 409608183.

It is a congruent number.

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, 31549 + ... + 41939.

It is an arithmetic number, because the mean of its divisors is an integer number (29851020).

Almost surely, 2^381806904 is an apocalyptic number.

It is an amenable number.

381806904 is an abundant number, since it is smaller than the sum of its proper divisors (573425736).

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

381806904 is a wasteful number, since it uses less digits than its factorization.

381806904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11931 (or 11927 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 381806904 is about 19539.8798358639. The cubic root of 381806904 is about 725.4618723217.

The spelling of 381806904 in words is "three hundred eighty-one million, eight hundred six thousand, nine hundred four".