18565012 has 12 divisors (see below), whose sum is σ = 32811156. Its totient is φ = 9190400.

The previous prime is 18564991. The next prime is 18565013. The reversal of 18565012 is 21056581.

It can be written as a sum of positive squares in 2 ways, for example, as 12630916 + 5934096 = 3554^2 + 2436^2 .

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18565013) 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, 22573 + ... + 23380.

It is an arithmetic number, because the mean of its divisors is an integer number (2734263).

Almost surely, 2^18565012 is an apocalyptic number.

It is an amenable number.

18565012 is a deficient number, since it is larger than the sum of its proper divisors (14246144).

18565012 is a wasteful number, since it uses less digits than its factorization.

18565012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46058 (or 46056 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 18565012 is about 4308.7134970894. The cubic root of 18565012 is about 264.7880683616.

The spelling of 18565012 in words is "eighteen million, five hundred sixty-five thousand, twelve".