8721889 has 16 divisors (see below), whose sum is σ = 9906624. Its totient is φ = 7609600.

The previous prime is 8721883. The next prime is 8721907. The reversal of 8721889 is 9881278.

It is a de Polignac number, because none of the positive numbers 2^k-8721889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8721883) 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, 37317 + ... + 37549.

It is an arithmetic number, because the mean of its divisors is an integer number (619164).

Almost surely, 2^8721889 is an apocalyptic number.

It is an amenable number.

8721889 is a deficient number, since it is larger than the sum of its proper divisors (1184735).

8721889 is a wasteful number, since it uses less digits than its factorization.

8721889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368.

The product of its digits is 64512, while the sum is 43.

The square root of 8721889 is about 2953.2844427857. The cubic root of 8721889 is about 205.8433550097.

The spelling of 8721889 in words is "eight million, seven hundred twenty-one thousand, eight hundred eighty-nine".