18516969 has 6 divisors (see below), whose sum is σ = 26746746. Its totient is φ = 12344640.

The previous prime is 18516947. The next prime is 18516989. The reversal of 18516969 is 96961581.

It can be written as a sum of positive squares in only one way, i.e., 13838400 + 4678569 = 3720^2 + 2163^2 .

It is not a de Polignac number, because 18516969 - 2⁵ = 18516937 is a prime.

It is a super-2 number, since 2×18516969² = 685756281893922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18516929) 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 5 ways as a sum of consecutive naturals, for example, 1028712 + ... + 1028729.

It is an arithmetic number, because the mean of its divisors is an integer number (4457791).

Almost surely, 2^18516969 is an apocalyptic number.

It is an amenable number.

18516969 is a deficient number, since it is larger than the sum of its proper divisors (8229777).

18516969 is a wasteful number, since it uses less digits than its factorization.

18516969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057447 (or 2057444 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 18516969 is about 4303.1347875706. The cubic root of 18516969 is about 264.5594626669.

The spelling of 18516969 in words is "eighteen million, five hundred sixteen thousand, nine hundred sixty-nine".