8724991 has 4 divisors (see below), whose sum is σ = 9518184. Its totient is φ = 7931800.

The previous prime is 8724983. The next prime is 8725021. The reversal of 8724991 is 1994278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8724991 - 2³ = 8724983 is a prime.

It is a super-2 number, since 2×8724991² = 152250935900162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8722991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396580 + ... + 396601.

It is an arithmetic number, because the mean of its divisors is an integer number (2379546).

Almost surely, 2^8724991 is an apocalyptic number.

8724991 is a deficient number, since it is larger than the sum of its proper divisors (793193).

8724991 is a wasteful number, since it uses less digits than its factorization.

8724991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793192.

The product of its digits is 36288, while the sum is 40.

The square root of 8724991 is about 2953.8095740924. The cubic root of 8724991 is about 205.8677553204.

The spelling of 8724991 in words is "eight million, seven hundred twenty-four thousand, nine hundred ninety-one".