18716013 has 6 divisors (see below), whose sum is σ = 27034254. Its totient is φ = 12477336.

The previous prime is 18716003. The next prime is 18716017. The reversal of 18716013 is 31061781.

It can be written as a sum of positive squares in only one way, i.e., 18636489 + 79524 = 4317^2 + 282^2 .

It is not a de Polignac number, because 18716013 - 2²² = 14521709 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18716017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1039770 + ... + 1039787.

It is an arithmetic number, because the mean of its divisors is an integer number (4505709).

Almost surely, 2^18716013 is an apocalyptic number.

It is an amenable number.

18716013 is a deficient number, since it is larger than the sum of its proper divisors (8318241).

18716013 is a wasteful number, since it uses less digits than its factorization.

18716013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079563 (or 2079560 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 18716013 is about 4326.2007581711. The cubic root of 18716013 is about 265.5040270916.

Adding to 18716013 its reverse (31061781), we get a palindrome (49777794).

The spelling of 18716013 in words is "eighteen million, seven hundred sixteen thousand, thirteen".