381390906 has 32 divisors (see below), whose sum is σ = 827947008. Its totient is φ = 116424000.

The previous prime is 381390887. The next prime is 381390941. The reversal of 381390906 is 609093183.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9345 + ... + 29156.

It is an arithmetic number, because the mean of its divisors is an integer number (25873344).

Almost surely, 2^381390906 is an apocalyptic number.

381390906 is an abundant number, since it is smaller than the sum of its proper divisors (446556102).

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

381390906 is a wasteful number, since it uses less digits than its factorization.

381390906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38646.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 381390906 is about 19529.2320893577. The cubic root of 381390906 is about 725.1983007304.

The spelling of 381390906 in words is "three hundred eighty-one million, three hundred ninety thousand, nine hundred six".