870831 has 20 divisors (see below), whose sum is σ = 1402632. Its totient is φ = 535248.

The previous prime is 870823. The next prime is 870833. The reversal of 870831 is 138078.

870831 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 870831 - 2³ = 870823 is a prime.

It is a super-2 number, since 2×870831² = 1516693261122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

870831 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 870795 and 870804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870833) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 640 + ... + 1466.

2⁸⁷⁰⁸³¹ is an apocalyptic number.

870831 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

870831 is a deficient number, since it is larger than the sum of its proper divisors (531801).

870831 is a wasteful number, since it uses less digits than its factorization.

870831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852 (or 843 counting only the distinct ones).

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

The square root of 870831 is about 933.1832617444. The cubic root of 870831 is about 95.4944122897.

The spelling of 870831 in words is "eight hundred seventy thousand, eight hundred thirty-one".