18738513 has 8 divisors (see below), whose sum is σ = 27760800. Its totient is φ = 12492324.

The previous prime is 18738479. The next prime is 18738523. The reversal of 18738513 is 31583781.

It is not a de Polignac number, because 18738513 - 2¹⁰ = 18737489 is a prime.

It is a super-2 number, since 2×18738513² = 702263738902338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18738523) 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, 346983 + ... + 347036.

It is an arithmetic number, because the mean of its divisors is an integer number (3470100).

Almost surely, 2^18738513 is an apocalyptic number.

It is an amenable number.

18738513 is a deficient number, since it is larger than the sum of its proper divisors (9022287).

18738513 is an equidigital number, since it uses as much as digits as its factorization.

18738513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694028 (or 694022 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 18738513 is about 4328.8004111994. The cubic root of 18738513 is about 265.6103789507.

The spelling of 18738513 in words is "eighteen million, seven hundred thirty-eight thousand, five hundred thirteen".