17933989 has 2 divisors, whose sum is σ = 17933990. Its totient is φ = 17933988.

The previous prime is 17933987. The next prime is 17933999. The reversal of 17933989 is 98933971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11390625 + 6543364 = 3375^2 + 2558^2 .

It is a cyclic number.

It is not a de Polignac number, because 17933989 - 2¹ = 17933987 is a prime.

It is a super-2 number, since 2×17933989² = 643255922904242, which contains 22 as substring.

Together with 17933987, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17933987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8966994 + 8966995.

It is an arithmetic number, because the mean of its divisors is an integer number (8966995).

Almost surely, 2^17933989 is an apocalyptic number.

It is an amenable number.

17933989 is a deficient number, since it is larger than the sum of its proper divisors (1).

17933989 is an equidigital number, since it uses as much as digits as its factorization.

17933989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 17933989 is about 4234.8540706853. The cubic root of 17933989 is about 261.7533807745.

The spelling of 17933989 in words is "seventeen million, nine hundred thirty-three thousand, nine hundred eighty-nine".