17872489 has 2 divisors, whose sum is σ = 17872490. Its totient is φ = 17872488.

The previous prime is 17872487. The next prime is 17872499. The reversal of 17872489 is 98427871.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9363600 + 8508889 = 3060^2 + 2917^2 .

It is a cyclic number.

It is not a de Polignac number, because 17872489 - 2¹ = 17872487 is a prime.

Together with 17872487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (17872487) 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, 8936244 + 8936245.

It is an arithmetic number, because the mean of its divisors is an integer number (8936245).

Almost surely, 2^17872489 is an apocalyptic number.

It is an amenable number.

17872489 is a deficient number, since it is larger than the sum of its proper divisors (1).

17872489 is an equidigital number, since it uses as much as digits as its factorization.

17872489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 46.

The square root of 17872489 is about 4227.5866638071. The cubic root of 17872489 is about 261.4538328197.

The spelling of 17872489 in words is "seventeen million, eight hundred seventy-two thousand, four hundred eighty-nine".