8721459 has 16 divisors (see below), whose sum is σ = 13681440. Its totient is φ = 5472000.

The previous prime is 8721443. The next prime is 8721467. The reversal of 8721459 is 9541278.

It is not a de Polignac number, because 8721459 - 2⁴ = 8721443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8721469) 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, 9042 + ... + 9959.

It is an arithmetic number, because the mean of its divisors is an integer number (855090).

Almost surely, 2^8721459 is an apocalyptic number.

8721459 is a deficient number, since it is larger than the sum of its proper divisors (4959981).

8721459 is a wasteful number, since it uses less digits than its factorization.

8721459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19027 (or 19021 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 8721459 is about 2953.2116415862. The cubic root of 8721459 is about 205.8399721761.

It can be divided in two parts, 8721 and 459, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 8721459 in words is "eight million, seven hundred twenty-one thousand, four hundred fifty-nine".