18944513 has 8 divisors (see below), whose sum is σ = 21690240. Its totient is φ = 16208640.

The previous prime is 18944507. The next prime is 18944521. The reversal of 18944513 is 31544981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18944513 - 2⁸ = 18944257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18944533) 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, 2273 + ... + 6561.

It is an arithmetic number, because the mean of its divisors is an integer number (2711280).

Almost surely, 2^18944513 is an apocalyptic number.

It is an amenable number.

18944513 is a deficient number, since it is larger than the sum of its proper divisors (2745727).

18944513 is an equidigital number, since it uses as much as digits as its factorization.

18944513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4927.

The product of its digits is 17280, while the sum is 35.

The square root of 18944513 is about 4352.5294944434. The cubic root of 18944513 is about 266.5801544019.

The spelling of 18944513 in words is "eighteen million, nine hundred forty-four thousand, five hundred thirteen".