8908729 has 4 divisors (see below), whose sum is σ = 8923876. Its totient is φ = 8893584.

The previous prime is 8908727. The next prime is 8908733. The reversal of 8908729 is 9278098.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9278098 = 2 ⋅4639049.

It can be written as a sum of positive squares in 2 ways, for example, as 1742400 + 7166329 = 1320^2 + 2677^2 .

It is a cyclic number.

It is not a de Polignac number, because 8908729 - 2¹ = 8908727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8908721) 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, 6654 + ... + 7879.

It is an arithmetic number, because the mean of its divisors is an integer number (2230969).

Almost surely, 2^8908729 is an apocalyptic number.

It is an amenable number.

8908729 is a deficient number, since it is larger than the sum of its proper divisors (15147).

8908729 is a wasteful number, since it uses less digits than its factorization.

8908729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15146.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 8908729 is about 2984.7494032163. The cubic root of 8908729 is about 207.3028388020.

The spelling of 8908729 in words is "eight million, nine hundred eight thousand, seven hundred twenty-nine".