18133423 has 24 divisors (see below), whose sum is σ = 23152640. Its totient is φ = 13899600.

The previous prime is 18133417. The next prime is 18133433. The reversal of 18133423 is 32433181.

It is not a de Polignac number, because 18133423 - 2²¹ = 16036271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18133433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66778 + ... + 67048.

Almost surely, 2^18133423 is an apocalyptic number.

18133423 is a deficient number, since it is larger than the sum of its proper divisors (5019217).

18133423 is a wasteful number, since it uses less digits than its factorization.

18133423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379 (or 368 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 18133423 is about 4258.3357077619. The cubic root of 18133423 is about 262.7200778708.

The spelling of 18133423 in words is "eighteen million, one hundred thirty-three thousand, four hundred twenty-three".