381685905 has 32 divisors (see below), whose sum is σ = 679660800. Its totient is φ = 203233536.

The previous prime is 381685883. The next prime is 381685937. The reversal of 381685905 is 509586183.

It is not a de Polignac number, because 381685905 - 2⁶ = 381685841 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96201 + ... + 100089.

It is an arithmetic number, because the mean of its divisors is an integer number (21239400).

Almost surely, 2^381685905 is an apocalyptic number.

It is an amenable number.

381685905 is a deficient number, since it is larger than the sum of its proper divisors (297974895).

381685905 is a wasteful number, since it uses less digits than its factorization.

381685905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630 (or 4624 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 381685905 is about 19536.7833841705. The cubic root of 381685905 is about 725.3852284872.

The spelling of 381685905 in words is "three hundred eighty-one million, six hundred eighty-five thousand, nine hundred five".