861421272 has 32 divisors (see below), whose sum is σ = 2211759600. Its totient is φ = 279379584.

The previous prime is 861421241. The next prime is 861421283. The reversal of 861421272 is 272124168.

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, 484147 + ... + 485922.

Almost surely, 2^861421272 is an apocalyptic number.

It is an amenable number.

861421272 is an abundant number, since it is smaller than the sum of its proper divisors (1350338328).

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

861421272 is a wasteful number, since it uses less digits than its factorization.

861421272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970115 (or 970111 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 861421272 is about 29349.9790800607. The cubic root of 861421272 is about 951.4921231204.

The spelling of 861421272 in words is "eight hundred sixty-one million, four hundred twenty-one thousand, two hundred seventy-two".