861421292 has 6 divisors (see below), whose sum is σ = 1507487268. Its totient is φ = 430710644.

The previous prime is 861421291. The next prime is 861421343. The reversal of 861421292 is 292124168.

It is not an unprimeable number, because it can be changed into a prime (861421291) by changing a digit.

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 as a sum of consecutive naturals, namely, 107677658 + ... + 107677665.

It is an arithmetic number, because the mean of its divisors is an integer number (251247878).

Almost surely, 2^861421292 is an apocalyptic number.

It is an amenable number.

861421292 is a deficient number, since it is larger than the sum of its proper divisors (646065976).

861421292 is a wasteful number, since it uses less digits than its factorization.

861421292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215355327 (or 215355325 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 861421292 is about 29349.9794207764. The cubic root of 861421292 is about 951.4921304841.

The spelling of 861421292 in words is "eight hundred sixty-one million, four hundred twenty-one thousand, two hundred ninety-two".