18243933 has 16 divisors (see below), whose sum is σ = 25867200. Its totient is φ = 11404800.

The previous prime is 18243917. The next prime is 18243949. The reversal of 18243933 is 33934281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18243917) and next prime (18243949).

It is not a de Polignac number, because 18243933 - 2⁴ = 18243917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18243894 and 18243903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18243913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4173 + ... + 7341.

It is an arithmetic number, because the mean of its divisors is an integer number (1616700).

Almost surely, 2^18243933 is an apocalyptic number.

It is an amenable number.

18243933 is a deficient number, since it is larger than the sum of its proper divisors (7623267).

18243933 is a wasteful number, since it uses less digits than its factorization.

18243933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3292.

The product of its digits is 15552, while the sum is 33.

The square root of 18243933 is about 4271.2917249937. The cubic root of 18243933 is about 263.2526931775.

It can be divided in two parts, 18 and 243933, that added together give a triangular number (243951 = T₆₉₈).

The spelling of 18243933 in words is "eighteen million, two hundred forty-three thousand, nine hundred thirty-three".