18664933 has 6 divisors (see below), whose sum is σ = 21712326. Its totient is φ = 15998472.

The previous prime is 18664913. The next prime is 18664949. The reversal of 18664933 is 33946681.

It can be written as a sum of positive squares in only one way, i.e., 13198689 + 5466244 = 3633^2 + 2338^2 .

It is not a de Polignac number, because 18664933 - 2¹⁷ = 18533861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18664913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 190410 + ... + 190507.

It is an arithmetic number, because the mean of its divisors is an integer number (3618721).

Almost surely, 2^18664933 is an apocalyptic number.

It is an amenable number.

18664933 is a deficient number, since it is larger than the sum of its proper divisors (3047393).

18664933 is an equidigital number, since it uses as much as digits as its factorization.

18664933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380931 (or 380924 counting only the distinct ones).

The product of its digits is 93312, while the sum is 40.

The square root of 18664933 is about 4320.2931613491. The cubic root of 18664933 is about 265.2622679402.

The spelling of 18664933 in words is "eighteen million, six hundred sixty-four thousand, nine hundred thirty-three".