8921972 has 6 divisors (see below), whose sum is σ = 15613458. Its totient is φ = 4460984.

The previous prime is 8921959. The next prime is 8921989. The reversal of 8921972 is 2791298.

It can be written as a sum of positive squares in only one way, i.e., 8916196 + 5776 = 2986^2 + 76^2 .

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115243 + ... + 1115250.

It is an arithmetic number, because the mean of its divisors is an integer number (2602243).

Almost surely, 2^8921972 is an apocalyptic number.

It is an amenable number.

8921972 is a deficient number, since it is larger than the sum of its proper divisors (6691486).

8921972 is a wasteful number, since it uses less digits than its factorization.

8921972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230497 (or 2230495 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 8921972 is about 2986.9670235876. The cubic root of 8921972 is about 207.4055078545.

The spelling of 8921972 in words is "eight million, nine hundred twenty-one thousand, nine hundred seventy-two".