18394933 has 2 divisors, whose sum is σ = 18394934. Its totient is φ = 18394932.

The previous prime is 18394921. The next prime is 18394951. The reversal of 18394933 is 33949381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17156164 + 1238769 = 4142^2 + 1113^2 .

It is a cyclic number.

It is not a de Polignac number, because 18394933 - 2⁹ = 18394421 is a prime.

It is a super-4 number, since 4×18394933⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18394993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9197466 + 9197467.

It is an arithmetic number, because the mean of its divisors is an integer number (9197467).

Almost surely, 2^18394933 is an apocalyptic number.

It is an amenable number.

18394933 is a deficient number, since it is larger than the sum of its proper divisors (1).

18394933 is an equidigital number, since it uses as much as digits as its factorization.

18394933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 40.

The square root of 18394933 is about 4288.9314520053. The cubic root of 18394933 is about 263.9769885437.

The spelling of 18394933 in words is "eighteen million, three hundred ninety-four thousand, nine hundred thirty-three".