381957 has 8 divisors (see below), whose sum is σ = 536160. Its totient is φ = 241200.

The previous prime is 381949. The next prime is 381977. The reversal of 381957 is 759183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 381957 - 2³ = 381949 is a prime.

It is a super-2 number, since 2×381957² = 291782299698, which contains 22 as substring.

381957 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3294 + ... + 3407.

It is an arithmetic number, because the mean of its divisors is an integer number (67020).

2³⁸¹⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

381957 is a deficient number, since it is larger than the sum of its proper divisors (154203).

381957 is a wasteful number, since it uses less digits than its factorization.

381957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6723.

The product of its digits is 7560, while the sum is 33.

The square root of 381957 is about 618.0266984524. The cubic root of 381957 is about 72.5556924435. Note that the first 3 decimals are identical.

Subtracting from 381957 its sum of digits (33), we obtain a square (381924 = 618²).

The spelling of 381957 in words is "three hundred eighty-one thousand, nine hundred fifty-seven".