18556013 has 8 divisors (see below), whose sum is σ = 21350400. Its totient is φ = 15797520.

The previous prime is 18556007. The next prime is 18556037. The reversal of 18556013 is 31065581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18556013 - 2⁴ = 18555997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18556093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7853 + ... + 9938.

It is an arithmetic number, because the mean of its divisors is an integer number (2668800).

Almost surely, 2^18556013 is an apocalyptic number.

It is an amenable number.

18556013 is a deficient number, since it is larger than the sum of its proper divisors (2794387).

18556013 is a wasteful number, since it uses less digits than its factorization.

18556013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17947.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 18556013 is about 4307.6690912836. The cubic root of 18556013 is about 264.7452779603.

The spelling of 18556013 in words is "eighteen million, five hundred fifty-six thousand, thirteen".