860840 has 16 divisors (see below), whose sum is σ = 1936980. Its totient is φ = 344320.

The previous prime is 860819. The next prime is 860843. The reversal of 860840 is 48068.

860840 = T₃₂₀ + T₃₂₁ + ... + T₃₃₅.

It can be written as a sum of positive squares in 2 ways, for example, as 857476 + 3364 = 926^2 + 58^2 .

It is not an unprimeable number, because it can be changed into a prime (860843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10721 + ... + 10800.

2⁸⁶⁰⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

860840 is an abundant number, since it is smaller than the sum of its proper divisors (1076140).

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

860840 is a wasteful number, since it uses less digits than its factorization.

860840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21532 (or 21528 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 860840 is about 927.8146366597. The cubic root of 860840 is about 95.1278058219.

The spelling of 860840 in words is "eight hundred sixty thousand, eight hundred forty".