861492988 has 12 divisors (see below), whose sum is σ = 1510872160. Its totient is φ = 429815232.

The previous prime is 861492959. The next prime is 861493019. The reversal of 861492988 is 889294168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230733 + ... + 234436.

Almost surely, 2^861492988 is an apocalyptic number.

It is an amenable number.

861492988 is a deficient number, since it is larger than the sum of its proper divisors (649379172).

861492988 is a wasteful number, since it uses less digits than its factorization.

861492988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465636 (or 465634 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 55.

The square root of 861492988 is about 29351.2007931533. The cubic root of 861492988 is about 951.5185272805.

The spelling of 861492988 in words is "eight hundred sixty-one million, four hundred ninety-two thousand, nine hundred eighty-eight".