17748989 has 2 divisors, whose sum is σ = 17748990. Its totient is φ = 17748988.

The previous prime is 17748977. The next prime is 17749087. The reversal of 17748989 is 98984771.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13579225 + 4169764 = 3685^2 + 2042^2 .

It is an emirp because it is prime and its reverse (98984771) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17748989 - 2¹⁶ = 17683453 is a prime.

It is a super-2 number, since 2×17748989² = 630053221044242, which contains 22 as substring.

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 17748989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17748959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8874494 + 8874495.

It is an arithmetic number, because the mean of its divisors is an integer number (8874495).

Almost surely, 2^17748989 is an apocalyptic number.

It is an amenable number.

17748989 is a deficient number, since it is larger than the sum of its proper divisors (1).

17748989 is an equidigital number, since it uses as much as digits as its factorization.

17748989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 53.

The square root of 17748989 is about 4212.9549012540. The cubic root of 17748989 is about 260.8502196455.

The spelling of 17748989 in words is "seventeen million, seven hundred forty-eight thousand, nine hundred eighty-nine".