17942189 has 2 divisors, whose sum is σ = 17942190. Its totient is φ = 17942188.

The previous prime is 17942167. The next prime is 17942201. The reversal of 17942189 is 98124971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17724100 + 218089 = 4210^2 + 467^2 .

It is a cyclic number.

It is not a de Polignac number, because 17942189 - 2¹² = 17938093 is a prime.

It is a super-2 number, since 2×17942189² = 643844292223442, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17942129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8971094 + 8971095.

It is an arithmetic number, because the mean of its divisors is an integer number (8971095).

Almost surely, 2^17942189 is an apocalyptic number.

It is an amenable number.

17942189 is a deficient number, since it is larger than the sum of its proper divisors (1).

17942189 is an equidigital number, since it uses as much as digits as its factorization.

17942189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 17942189 is about 4235.8221161895. The cubic root of 17942189 is about 261.7932687339.

The spelling of 17942189 in words is "seventeen million, nine hundred forty-two thousand, one hundred eighty-nine".