861917492 has 24 divisors (see below), whose sum is σ = 1529673600. Its totient is φ = 424884096.

The previous prime is 861917477. The next prime is 861917503. The reversal of 861917492 is 294719168.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277484 + ... + 280572.

It is an arithmetic number, because the mean of its divisors is an integer number (63736400).

Almost surely, 2^861917492 is an apocalyptic number.

It is an amenable number.

861917492 is a deficient number, since it is larger than the sum of its proper divisors (667756108).

861917492 is a wasteful number, since it uses less digits than its factorization.

861917492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4055 (or 4053 counting only the distinct ones).

The product of its digits is 217728, while the sum is 47.

The square root of 861917492 is about 29358.4313613653. The cubic root of 861917492 is about 951.6747897611.

The spelling of 861917492 in words is "eight hundred sixty-one million, nine hundred seventeen thousand, four hundred ninety-two".