17939189 has 2 divisors, whose sum is σ = 17939190. Its totient is φ = 17939188.

The previous prime is 17939179. The next prime is 17939203. The reversal of 17939189 is 98193971.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13380964 + 4558225 = 3658^2 + 2135^2 .

It is a cyclic number.

It is not a de Polignac number, because 17939189 - 2⁸ = 17938933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17939179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8969594 + 8969595.

It is an arithmetic number, because the mean of its divisors is an integer number (8969595).

Almost surely, 2^17939189 is an apocalyptic number.

It is an amenable number.

17939189 is a deficient number, since it is larger than the sum of its proper divisors (1).

17939189 is an equidigital number, since it uses as much as digits as its factorization.

17939189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 47.

The square root of 17939189 is about 4235.4679788661. The cubic root of 17939189 is about 261.7786769881.

The spelling of 17939189 in words is "seventeen million, nine hundred thirty-nine thousand, one hundred eighty-nine".