861420939 has 16 divisors (see below), whose sum is σ = 1180465440. Its totient is φ = 558351360.

The previous prime is 861420929. The next prime is 861420983. The reversal of 861420939 is 939024168.

It is not a de Polignac number, because 861420939 - 2²³ = 853032331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861420939.

It is not an unprimeable number, because it can be changed into a prime (861420929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254619 + ... + 257979.

It is an arithmetic number, because the mean of its divisors is an integer number (73779090).

Almost surely, 2^861420939 is an apocalyptic number.

861420939 is a deficient number, since it is larger than the sum of its proper divisors (319044501).

861420939 is a wasteful number, since it uses less digits than its factorization.

861420939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5710.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 861420939 is about 29349.9734071430. The cubic root of 861420939 is about 951.4920005141.

The spelling of 861420939 in words is "eight hundred sixty-one million, four hundred twenty thousand, nine hundred thirty-nine".