18305913 has 8 divisors (see below), whose sum is σ = 24428800. Its totient is φ = 12193488.

The previous prime is 18305909. The next prime is 18305921. The reversal of 18305913 is 31950381.

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 18305913 - 2² = 18305909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18305993) 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, 3543 + ... + 7011.

It is an arithmetic number, because the mean of its divisors is an integer number (3053600).

Almost surely, 2^18305913 is an apocalyptic number.

It is an amenable number.

18305913 is a deficient number, since it is larger than the sum of its proper divisors (6122887).

18305913 is a wasteful number, since it uses less digits than its factorization.

18305913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5231.

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

The square root of 18305913 is about 4278.5409896365. The cubic root of 18305913 is about 263.5504717964.

The spelling of 18305913 in words is "eighteen million, three hundred five thousand, nine hundred thirteen".