18228313 has 8 divisors (see below), whose sum is σ = 18750816. Its totient is φ = 17709600.

The previous prime is 18228307. The next prime is 18228317. The reversal of 18228313 is 31382281.

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

It is a cyclic number.

It is not a de Polignac number, because 18228313 - 2⁵ = 18228281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18228317) 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, 10818 + ... + 12388.

It is an arithmetic number, because the mean of its divisors is an integer number (2343852).

Almost surely, 2^18228313 is an apocalyptic number.

It is an amenable number.

18228313 is a deficient number, since it is larger than the sum of its proper divisors (522503).

18228313 is a wasteful number, since it uses less digits than its factorization.

18228313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895.

The product of its digits is 2304, while the sum is 28.

The square root of 18228313 is about 4269.4628467759. The cubic root of 18228313 is about 263.1775415977.

The spelling of 18228313 in words is "eighteen million, two hundred twenty-eight thousand, three hundred thirteen".