18930113 has 6 divisors (see below), whose sum is σ = 19221426. Its totient is φ = 18643152.

The previous prime is 18930101. The next prime is 18930133. The reversal of 18930113 is 31103981.

It can be written as a sum of positive squares in only one way, i.e., 18386944 + 543169 = 4288^2 + 737^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18930113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18930133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2381 + ... + 6597.

It is an arithmetic number, because the mean of its divisors is an integer number (3203571).

Almost surely, 2^18930113 is an apocalyptic number.

It is an amenable number.

18930113 is a deficient number, since it is larger than the sum of its proper divisors (291313).

18930113 is an frugal number, since it uses more digits than its factorization.

18930113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4351 (or 4284 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 18930113 is about 4350.8749694745. The cubic root of 18930113 is about 266.5125934629.

The spelling of 18930113 in words is "eighteen million, nine hundred thirty thousand, one hundred thirteen".