18904133 has 4 divisors (see below), whose sum is σ = 19343808. Its totient is φ = 18464460.

The previous prime is 18904111. The next prime is 18904159. The reversal of 18904133 is 33140981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33140981 = 887 ⋅37363.

It is a cyclic number.

It is not a de Polignac number, because 18904133 - 2¹⁸ = 18641989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18904096 and 18904105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18904103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219773 + ... + 219858.

It is an arithmetic number, because the mean of its divisors is an integer number (4835952).

Almost surely, 2^18904133 is an apocalyptic number.

It is an amenable number.

18904133 is a deficient number, since it is larger than the sum of its proper divisors (439675).

18904133 is an equidigital number, since it uses as much as digits as its factorization.

18904133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439674.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 18904133 is about 4347.8883380326. Note that the first 3 decimals coincide. The cubic root of 18904133 is about 266.3906155481.

The spelling of 18904133 in words is "eighteen million, nine hundred four thousand, one hundred thirty-three".