8638969 has 4 divisors (see below), whose sum is σ = 8663796. Its totient is φ = 8614144.

The previous prime is 8638967. The next prime is 8638991. The reversal of 8638969 is 9698368.

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 5234944 + 3404025 = 2288^2 + 1845^2 .

It is a cyclic number.

It is not a de Polignac number, because 8638969 - 2¹ = 8638967 is a prime.

It is a super-2 number, since 2×8638969² = 149263570765922, which contains 22 as substring.

It is a Duffinian number.

8638969 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8638967) 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, 11884 + ... + 12589.

It is an arithmetic number, because the mean of its divisors is an integer number (2165949).

Almost surely, 2^8638969 is an apocalyptic number.

It is an amenable number.

8638969 is a deficient number, since it is larger than the sum of its proper divisors (24827).

8638969 is a wasteful number, since it uses less digits than its factorization.

8638969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24826.

The product of its digits is 559872, while the sum is 49.

The square root of 8638969 is about 2939.2123094462. The cubic root of 8638969 is about 205.1889513080.

The spelling of 8638969 in words is "eight million, six hundred thirty-eight thousand, nine hundred sixty-nine".