861421164 has 24 divisors (see below), whose sum is σ = 2115771840. Its totient is φ = 272027664.

The previous prime is 861421157. The next prime is 861421213. The reversal of 861421164 is 461124168.

It is a super-2 number, since 2×861421164² = 1484092843574229792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1888854 + ... + 1889309.

It is an arithmetic number, because the mean of its divisors is an integer number (88157160).

Almost surely, 2^861421164 is an apocalyptic number.

It is an amenable number.

861421164 is an abundant number, since it is smaller than the sum of its proper divisors (1254350676).

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

861421164 is a wasteful number, since it uses less digits than its factorization.

861421164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3778189 (or 3778187 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 861421164 is about 29349.9772401956. The cubic root of 861421164 is about 951.4920833562.

The spelling of 861421164 in words is "eight hundred sixty-one million, four hundred twenty-one thousand, one hundred sixty-four".