18039933 has 12 divisors (see below), whose sum is σ = 26174460. Its totient is φ = 11972736.

The previous prime is 18039929. The next prime is 18039953. The reversal of 18039933 is 33993081.

It can be written as a sum of positive squares in 2 ways, for example, as 16305444 + 1734489 = 4038^2 + 1317^2 .

It is not a de Polignac number, because 18039933 - 2² = 18039929 is a prime.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18039953) 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, 2316 + ... + 6437.

It is an arithmetic number, because the mean of its divisors is an integer number (2181205).

Almost surely, 2^18039933 is an apocalyptic number.

It is an amenable number.

18039933 is a deficient number, since it is larger than the sum of its proper divisors (8134527).

18039933 is a wasteful number, since it uses less digits than its factorization.

18039933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8988 (or 8985 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 18039933 is about 4247.3442290448. The cubic root of 18039933 is about 262.2678001054.

The spelling of 18039933 in words is "eighteen million, thirty-nine thousand, nine hundred thirty-three".