871556 has 24 divisors (see below), whose sum is σ = 1846656. Its totient is φ = 351360.

The previous prime is 871553. The next prime is 871571. The reversal of 871556 is 655178.

It is a super-2 number, since 2×871556² = 1519219722272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 871556.

It is not an unprimeable number, because it can be changed into a prime (871553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440 + ... + 1391.

It is an arithmetic number, because the mean of its divisors is an integer number (76944).

2⁸⁷¹⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

871556 is an abundant number, since it is smaller than the sum of its proper divisors (975100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

871556 is a wasteful number, since it uses less digits than its factorization.

871556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859 (or 1857 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

The square root of 871556 is about 933.5716362444. The cubic root of 871556 is about 95.5209058514.

The spelling of 871556 in words is "eight hundred seventy-one thousand, five hundred fifty-six".