18219313 has 8 divisors (see below), whose sum is σ = 20891520. Its totient is φ = 15564480.

The previous prime is 18219307. The next prime is 18219317. The reversal of 18219313 is 31391281.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18219313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18219317) 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, 2008 + ... + 6361.

It is an arithmetic number, because the mean of its divisors is an integer number (2611440).

Almost surely, 2^18219313 is an apocalyptic number.

It is an amenable number.

18219313 is a deficient number, since it is larger than the sum of its proper divisors (2672207).

18219313 is an equidigital number, since it uses as much as digits as its factorization.

18219313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8687.

The product of its digits is 1296, while the sum is 28.

The square root of 18219313 is about 4268.4087198861. The cubic root of 18219313 is about 263.1342209349.

The spelling of 18219313 in words is "eighteen million, two hundred nineteen thousand, three hundred thirteen".