17964989 has 4 divisors (see below), whose sum is σ = 20531424. Its totient is φ = 15398556.

The previous prime is 17964967. The next prime is 17965043. The reversal of 17964989 is 98946971.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98946971 = 1823 ⋅54277.

It is a cyclic number.

It is not a de Polignac number, because 17964989 - 2¹² = 17960893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17964989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17964589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1283207 + ... + 1283220.

It is an arithmetic number, because the mean of its divisors is an integer number (5132856).

Almost surely, 2^17964989 is an apocalyptic number.

It is an amenable number.

17964989 is a deficient number, since it is larger than the sum of its proper divisors (2566435).

17964989 is an equidigital number, since it uses as much as digits as its factorization.

17964989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566434.

The product of its digits is 979776, while the sum is 53.

The square root of 17964989 is about 4238.5125928797. The cubic root of 17964989 is about 261.9041128826.

The spelling of 17964989 in words is "seventeen million, nine hundred sixty-four thousand, nine hundred eighty-nine".