870381 has 12 divisors (see below), whose sum is σ = 1271452. Its totient is φ = 573696.

The previous prime is 870367. The next prime is 870391. The reversal of 870381 is 183078.

It can be written as a sum of positive squares in 2 ways, for example, as 585225 + 285156 = 765^2 + 534^2 .

It is not a de Polignac number, because 870381 - 2⁷ = 870253 is a prime.

It is a super-2 number, since 2×870381² = 1515126170322, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

870381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 375 + ... + 1371.

2⁸⁷⁰³⁸¹ is an apocalyptic number.

It is an amenable number.

870381 is a deficient number, since it is larger than the sum of its proper divisors (401071).

870381 is a wasteful number, since it uses less digits than its factorization.

870381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100 (or 1097 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 870381 is about 932.9421203912. The cubic root of 870381 is about 95.4779606132.

The spelling of 870381 in words is "eight hundred seventy thousand, three hundred eighty-one".