18905313 has 8 divisors (see below), whose sum is σ = 28808128. Its totient is φ = 10803024.

The previous prime is 18905279. The next prime is 18905317. The reversal of 18905313 is 31350981.

It is a happy number.

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

It is not a de Polignac number, because 18905313 - 2¹² = 18901217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18905317) 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, 450106 + ... + 450147.

It is an arithmetic number, because the mean of its divisors is an integer number (3601016).

Almost surely, 2^18905313 is an apocalyptic number.

It is an amenable number.

18905313 is a deficient number, since it is larger than the sum of its proper divisors (9902815).

18905313 is an equidigital number, since it uses as much as digits as its factorization.

18905313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900263.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 18905313 is about 4348.0240339722. The cubic root of 18905313 is about 266.3961581524.

The spelling of 18905313 in words is "eighteen million, nine hundred five thousand, three hundred thirteen".