7921744892 has 12 divisors (see below), whose sum is σ = 13903007160. Its totient is φ = 3949457136.

The previous prime is 7921744823. The next prime is 7921744907. The reversal of 7921744892 is 2984471297.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2852267 + ... + 2855042.

It is an arithmetic number, because the mean of its divisors is an integer number (1158583930).

Almost surely, 2^7921744892 is an apocalyptic number.

It is an amenable number.

7921744892 is a deficient number, since it is larger than the sum of its proper divisors (5981262268).

7921744892 is a wasteful number, since it uses less digits than its factorization.

7921744892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5707660 (or 5707658 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 53.

The square root of 7921744892 is about 89004.1846881370. The cubic root of 7921744892 is about 1993.4573612780.

The spelling of 7921744892 in words is "seven billion, nine hundred twenty-one million, seven hundred forty-four thousand, eight hundred ninety-two".