18503013 has 8 divisors (see below), whose sum is σ = 25272576. Its totient is φ = 12034400.

The previous prime is 18503003. The next prime is 18503033. The reversal of 18503013 is 31030581.

It is a happy number.

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 18503013 - 2⁶ = 18502949 is a prime.

It is a super-2 number, since 2×18503013² = 684722980156338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18503003) 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, 75093 + ... + 75338.

It is an arithmetic number, because the mean of its divisors is an integer number (3159072).

Almost surely, 2^18503013 is an apocalyptic number.

It is an amenable number.

18503013 is a deficient number, since it is larger than the sum of its proper divisors (6769563).

18503013 is a wasteful number, since it uses less digits than its factorization.

18503013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150475.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 18503013 is about 4301.5128733970. The cubic root of 18503013 is about 264.4929809471.

Adding to 18503013 its reverse (31030581), we get a palindrome (49533594).

The spelling of 18503013 in words is "eighteen million, five hundred three thousand, thirteen".