381375657 has 24 divisors (see below), whose sum is σ = 624478400. Its totient is φ = 222339168.

The previous prime is 381375653. The next prime is 381375667. The reversal of 381375657 is 756573183.

381375657 is a `hidden beast` number, since 3 + 81 + 3 + 7 + 565 + 7 = 666.

It is not a de Polignac number, because 381375657 - 2² = 381375653 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (381375653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83557 + ... + 88002.

Almost surely, 2^381375657 is an apocalyptic number.

It is an amenable number.

381375657 is a deficient number, since it is larger than the sum of its proper divisors (243102743).

381375657 is a wasteful number, since it uses less digits than its factorization.

381375657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171597 (or 171594 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 381375657 is about 19528.8416707187. The cubic root of 381375657 is about 725.1886354971.

The spelling of 381375657 in words is "three hundred eighty-one million, three hundred seventy-five thousand, six hundred fifty-seven".