381557 has 4 divisors (see below), whose sum is σ = 416256. Its totient is φ = 346860.

The previous prime is 381541. The next prime is 381559. The reversal of 381557 is 755183.

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 381557 - 2⁴ = 381541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381557.

It is not an unprimeable number, because it can be changed into a prime (381559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17333 + ... + 17354.

It is an arithmetic number, because the mean of its divisors is an integer number (104064).

2³⁸¹⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

381557 is a deficient number, since it is larger than the sum of its proper divisors (34699).

381557 is a wasteful number, since it uses less digits than its factorization.

381557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34698.

The product of its digits is 4200, while the sum is 29.

The square root of 381557 is about 617.7030030686. The cubic root of 381557 is about 72.5303558969.

The spelling of 381557 in words is "three hundred eighty-one thousand, five hundred fifty-seven".