17979749 has 2 divisors, whose sum is σ = 17979750. Its totient is φ = 17979748.

The previous prime is 17979707. The next prime is 17979763. The reversal of 17979749 is 94797971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17698849 + 280900 = 4207^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 17979749 - 2¹⁶ = 17914213 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 17979749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17979799) 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, 8989874 + 8989875.

It is an arithmetic number, because the mean of its divisors is an integer number (8989875).

Almost surely, 2^17979749 is an apocalyptic number.

It is an amenable number.

17979749 is a deficient number, since it is larger than the sum of its proper divisors (1).

17979749 is an equidigital number, since it uses as much as digits as its factorization.

17979749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1000188, while the sum is 53.

The square root of 17979749 is about 4240.2534122385. The cubic root of 17979749 is about 261.9758198845.

The spelling of 17979749 in words is "seventeen million, nine hundred seventy-nine thousand, seven hundred forty-nine".