18623013 has 4 divisors (see below), whose sum is σ = 24830688. Its totient is φ = 12415340.

The previous prime is 18623009. The next prime is 18623039. The reversal of 18623013 is 31032681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18623013 - 2² = 18623009 is a prime.

It is a super-2 number, since 2×18623013² = 693633226396338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18623083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3103833 + ... + 3103838.

It is an arithmetic number, because the mean of its divisors is an integer number (6207672).

Almost surely, 2^18623013 is an apocalyptic number.

It is an amenable number.

18623013 is a deficient number, since it is larger than the sum of its proper divisors (6207675).

18623013 is an equidigital number, since it uses as much as digits as its factorization.

18623013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6207674.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 18623013 is about 4315.4389116288. The cubic root of 18623013 is about 265.0635328861.

Adding to 18623013 its reverse (31032681), we get a palindrome (49655694).

The spelling of 18623013 in words is "eighteen million, six hundred twenty-three thousand, thirteen".