381715257 has 64 divisors (see below), whose sum is σ = 658538496. Its totient is φ = 190935360.

The previous prime is 381715249. The next prime is 381715261. The reversal of 381715257 is 752517183.

It is not a de Polignac number, because 381715257 - 2³ = 381715249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381711257) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 824208 + ... + 824670.

It is an arithmetic number, because the mean of its divisors is an integer number (10289664).

Almost surely, 2^381715257 is an apocalyptic number.

It is an amenable number.

381715257 is a deficient number, since it is larger than the sum of its proper divisors (276823239).

381715257 is a wasteful number, since it uses less digits than its factorization.

381715257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610.

The product of its digits is 58800, while the sum is 39.

The square root of 381715257 is about 19537.5345681076. The cubic root of 381715257 is about 725.4038222761.

The spelling of 381715257 in words is "three hundred eighty-one million, seven hundred fifteen thousand, two hundred fifty-seven".