18564945 has 16 divisors (see below), whose sum is σ = 33947520. Its totient is φ = 8486784.

The previous prime is 18564941. The next prime is 18564947. The reversal of 18564945 is 54946581.

It is not a de Polignac number, because 18564945 - 2² = 18564941 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18564897 and 18564906.

It is not an unprimeable number, because it can be changed into a prime (18564941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88300 + ... + 88509.

It is an arithmetic number, because the mean of its divisors is an integer number (2121720).

Almost surely, 2^18564945 is an apocalyptic number.

18564945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18564945 is a deficient number, since it is larger than the sum of its proper divisors (15382575).

18564945 is a wasteful number, since it uses less digits than its factorization.

18564945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176824.

The product of its digits is 172800, while the sum is 42.

The square root of 18564945 is about 4308.7057221398. The cubic root of 18564945 is about 264.7877498265.

The spelling of 18564945 in words is "eighteen million, five hundred sixty-four thousand, nine hundred forty-five".