866040 has 64 divisors (see below), whose sum is σ = 2972160. Its totient is φ = 197760.

The previous prime is 866029. The next prime is 866051. The reversal of 866040 is 40668.

866040 = T₁₂₁ + T₁₂₂ + ... + T₁₉₀.

It is an interprime number because it is at equal distance from previous prime (866029) and next prime (866051).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 866040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325 + ... + 1355.

It is an arithmetic number, because the mean of its divisors is an integer number (46440).

2⁸⁶⁶⁰⁴⁰ 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 866040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1486080).

866040 is an abundant number, since it is smaller than the sum of its proper divisors (2106120).

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

866040 is a wasteful number, since it uses less digits than its factorization.

866040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052 (or 1048 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 866040 is about 930.6127013962. The cubic root of 866040 is about 95.3189648038.

The spelling of 866040 in words is "eight hundred sixty-six thousand, forty".