381857187 has 32 divisors (see below), whose sum is σ = 535191552. Its totient is φ = 241981344.

The previous prime is 381857173. The next prime is 381857207. The reversal of 381857187 is 781758183.

It is a happy number.

It is not a de Polignac number, because 381857187 - 2⁸ = 381856931 is a prime.

It is a super-2 number, since 2×381857187² = 291629822527105938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381807187) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 783858 + ... + 784344.

It is an arithmetic number, because the mean of its divisors is an integer number (16724736).

Almost surely, 2^381857187 is an apocalyptic number.

381857187 is a deficient number, since it is larger than the sum of its proper divisors (153334365).

381857187 is a wasteful number, since it uses less digits than its factorization.

381857187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687.

The product of its digits is 376320, while the sum is 48.

The square root of 381857187 is about 19541.1664697888. The cubic root of 381857187 is about 725.4937180861.

The spelling of 381857187 in words is "three hundred eighty-one million, eight hundred fifty-seven thousand, one hundred eighty-seven".