861390940 has 24 divisors (see below), whose sum is σ = 1887570720. Its totient is φ = 329575488.

The previous prime is 861390919. The next prime is 861390979. The reversal of 861390940 is 49093168.

It is a junction number, because it is equal to n+sod(n) for n = 861390893 and 861390902.

It is a congruent number.

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, 935835 + ... + 936754.

It is an arithmetic number, because the mean of its divisors is an integer number (78648780).

Almost surely, 2^861390940 is an apocalyptic number.

It is an amenable number.

861390940 is an abundant number, since it is smaller than the sum of its proper divisors (1026179780).

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

861390940 is a wasteful number, since it uses less digits than its factorization.

861390940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872621 (or 1872619 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 861390940 is about 29349.4623460124. The cubic root of 861390940 is about 951.4809551438.

The spelling of 861390940 in words is "eight hundred sixty-one million, three hundred ninety thousand, nine hundred forty".