870840 has 96 divisors (see below), whose sum is σ = 2948400. Its totient is φ = 222720.

The previous prime is 870833. The next prime is 870847. The reversal of 870840 is 48078.

It is a happy number.

870840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (870833) and next prime (870847).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14731 + ... + 14789.

2⁸⁷⁰⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 870840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1474200).

870840 is an abundant number, since it is smaller than the sum of its proper divisors (2077560).

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

870840 is a wasteful number, since it uses less digits than its factorization.

870840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 870840 is about 933.1880839359. The cubic root of 870840 is about 95.4947412654.

The spelling of 870840 in words is "eight hundred seventy thousand, eight hundred forty".