18860013 has 16 divisors (see below), whose sum is σ = 28013760. Its totient is φ = 12540528.

The previous prime is 18860011. The next prime is 18860029. The reversal of 18860013 is 31006881.

It is not a de Polignac number, because 18860013 - 2¹ = 18860011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18860011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14131 + ... + 15407.

It is an arithmetic number, because the mean of its divisors is an integer number (1750860).

Almost surely, 2^18860013 is an apocalyptic number.

It is an amenable number.

18860013 is a deficient number, since it is larger than the sum of its proper divisors (9153747).

18860013 is a wasteful number, since it uses less digits than its factorization.

18860013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833 (or 1827 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18860013 is about 4342.8116468482. The cubic root of 18860013 is about 266.1832127662.

Adding to 18860013 its reverse (31006881), we get a palindrome (49866894).

The spelling of 18860013 in words is "eighteen million, eight hundred sixty thousand, thirteen".