8972809 has 4 divisors (see below), whose sum is σ = 9191700. Its totient is φ = 8753920.

The previous prime is 8972801. The next prime is 8972813. The reversal of 8972809 is 9082798.

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 3553225 + 5419584 = 1885^2 + 2328^2 .

It is a cyclic number.

It is not a de Polignac number, because 8972809 - 2³ = 8972801 is a prime.

It is a super-2 number, since 2×8972809² = 161022602700962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8972801) 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, 109384 + ... + 109465.

It is an arithmetic number, because the mean of its divisors is an integer number (2297925).

Almost surely, 2^8972809 is an apocalyptic number.

It is an amenable number.

8972809 is a deficient number, since it is larger than the sum of its proper divisors (218891).

8972809 is a wasteful number, since it uses less digits than its factorization.

8972809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218890.

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

The square root of 8972809 is about 2995.4647385673. The cubic root of 8972809 is about 207.7986911397.

The spelling of 8972809 in words is "eight million, nine hundred seventy-two thousand, eight hundred nine".