872248921 has 16 divisors (see below), whose sum is σ = 916012800. Its totient is φ = 829497088.

The previous prime is 872248919. The next prime is 872248957. The reversal of 872248921 is 129842278.

It is a cyclic number.

It is not a de Polignac number, because 872248921 - 2¹ = 872248919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (872248981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 585840 + ... + 587326.

It is an arithmetic number, because the mean of its divisors is an integer number (57250800).

Almost surely, 2^872248921 is an apocalyptic number.

It is an amenable number.

872248921 is a deficient number, since it is larger than the sum of its proper divisors (43763879).

872248921 is a wasteful number, since it uses less digits than its factorization.

872248921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808.

The product of its digits is 129024, while the sum is 43.

The square root of 872248921 is about 29533.8605840821. The cubic root of 872248921 is about 955.4621342722.

The spelling of 872248921 in words is "eight hundred seventy-two million, two hundred forty-eight thousand, nine hundred twenty-one".