18012133 has 4 divisors (see below), whose sum is σ = 18960160. Its totient is φ = 17064108.

The previous prime is 18012131. The next prime is 18012143. The reversal of 18012133 is 33121081.

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.

It is a cyclic number.

It is not a de Polignac number, because 18012133 - 2¹ = 18012131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 948007 = 18012133 / (1 + 8 + 0 + 1 + 2 + 1 + 3 + 3).

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 18012133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012131) 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, 473985 + ... + 474022.

It is an arithmetic number, because the mean of its divisors is an integer number (4740040).

Almost surely, 2^18012133 is an apocalyptic number.

It is an amenable number.

18012133 is a deficient number, since it is larger than the sum of its proper divisors (948027).

18012133 is an equidigital number, since it uses as much as digits as its factorization.

18012133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948026.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 18012133 is about 4244.0703340072. The cubic root of 18012133 is about 262.1330103720.

It can be divided in two parts, 18012 and 133, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 18012133 in words is "eighteen million, twelve thousand, one hundred thirty-three".