18813393 has 12 divisors (see below), whose sum is σ = 27306448. Its totient is φ = 12481560.

The previous prime is 18813391. The next prime is 18813419. The reversal of 18813393 is 39331881.

It is not a de Polignac number, because 18813393 - 2¹ = 18813391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18813391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3055 + ... + 6852.

Almost surely, 2^18813393 is an apocalyptic number.

It is an amenable number.

18813393 is a deficient number, since it is larger than the sum of its proper divisors (8493055).

18813393 is a wasteful number, since it uses less digits than its factorization.

18813393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10124 (or 10121 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 18813393 is about 4337.4408353314. The cubic root of 18813393 is about 265.9637060173.

The spelling of 18813393 in words is "eighteen million, eight hundred thirteen thousand, three hundred ninety-three".