381257 has 4 divisors (see below), whose sum is σ = 383760. Its totient is φ = 378756.

The previous prime is 381253. The next prime is 381287. The reversal of 381257 is 752183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 381257 - 2² = 381253 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381257.

It is not an unprimeable number, because it can be changed into a prime (381253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1007 + ... + 1332.

It is an arithmetic number, because the mean of its divisors is an integer number (95940).

2³⁸¹²⁵⁷ is an apocalyptic number.

It is an amenable number.

381257 is a deficient number, since it is larger than the sum of its proper divisors (2503).

381257 is a wasteful number, since it uses less digits than its factorization.

381257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502.

The product of its digits is 1680, while the sum is 26.

The square root of 381257 is about 617.4601201697. The cubic root of 381257 is about 72.5113418641.

The spelling of 381257 in words is "three hundred eighty-one thousand, two hundred fifty-seven".