381904 has 10 divisors (see below), whose sum is σ = 739970. Its totient is φ = 190944.

The previous prime is 381859. The next prime is 381911. The reversal of 381904 is 409183.

It can be written as a sum of positive squares in only one way, i.e., 360000 + 21904 = 600^2 + 148^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11919 + ... + 11950.

It is an arithmetic number, because the mean of its divisors is an integer number (73997).

2³⁸¹⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

381904 is a deficient number, since it is larger than the sum of its proper divisors (358066).

381904 is a wasteful number, since it uses less digits than its factorization.

381904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23877 (or 23871 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 381904 is about 617.9838185584. The cubic root of 381904 is about 72.5523363680.

The spelling of 381904 in words is "three hundred eighty-one thousand, nine hundred four".