8879729 has 4 divisors (see below), whose sum is σ = 9402084. Its totient is φ = 8357376.

The previous prime is 8879723. The next prime is 8879743. The reversal of 8879729 is 9279788.

It is a happy number.

8879729 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3794704 + 5085025 = 1948^2 + 2255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8879729 is a prime.

It is a super-2 number, since 2×8879729² = 157699174226882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8879723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261152 + ... + 261185.

It is an arithmetic number, because the mean of its divisors is an integer number (2350521).

Almost surely, 2^8879729 is an apocalyptic number.

It is an amenable number.

8879729 is a deficient number, since it is larger than the sum of its proper divisors (522355).

8879729 is a wasteful number, since it uses less digits than its factorization.

8879729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522354.

The product of its digits is 508032, while the sum is 50.

The square root of 8879729 is about 2979.8874139806. The cubic root of 8879729 is about 207.0776545136.

The spelling of 8879729 in words is "eight million, eight hundred seventy-nine thousand, seven hundred twenty-nine".