18858013 has 16 divisors (see below), whose sum is σ = 20759040. Its totient is φ = 17064000.

The previous prime is 18857989. The next prime is 18858019. The reversal of 18858013 is 31085881.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18858013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18858013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18858019) 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, 59331 + ... + 59647.

It is an arithmetic number, because the mean of its divisors is an integer number (1297440).

Almost surely, 2^18858013 is an apocalyptic number.

It is an amenable number.

18858013 is a deficient number, since it is larger than the sum of its proper divisors (1901027).

18858013 is a wasteful number, since it uses less digits than its factorization.

18858013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 18858013 is about 4342.5813751731. The cubic root of 18858013 is about 266.1738033480.

The spelling of 18858013 in words is "eighteen million, eight hundred fifty-eight thousand, thirteen".