861024 has 24 divisors (see below), whose sum is σ = 2260440. Its totient is φ = 286976.

The previous prime is 861019. The next prime is 861031. The reversal of 861024 is 420168.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 861024.

It is an unprimeable number.

861024 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4389 + ... + 4580.

It is an arithmetic number, because the mean of its divisors is an integer number (94185).

2⁸⁶¹⁰²⁴ is an apocalyptic number.

It is an amenable number.

861024 is an abundant number, since it is smaller than the sum of its proper divisors (1399416).

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

861024 is a wasteful number, since it uses less digits than its factorization.

861024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8982 (or 8974 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 861024 is about 927.9137890990. The cubic root of 861024 is about 95.1345830277.

The spelling of 861024 in words is "eight hundred sixty-one thousand, twenty-four".