19968489 has 12 divisors (see below), whose sum is σ = 30540276. Its totient is φ = 12529152.

The previous prime is 19968457. The next prime is 19968497. The reversal of 19968489 is 98486991.

It can be written as a sum of positive squares in 2 ways, for example, as 15093225 + 4875264 = 3885^2 + 2208^2 .

It is not a de Polignac number, because 19968489 - 2⁵ = 19968457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19968409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65104 + ... + 65409.

It is an arithmetic number, because the mean of its divisors is an integer number (2545023).

Almost surely, 2^19968489 is an apocalyptic number.

It is an amenable number.

19968489 is a deficient number, since it is larger than the sum of its proper divisors (10571787).

19968489 is a wasteful number, since it uses less digits than its factorization.

19968489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130536 (or 130533 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 19968489 is about 4468.6115293232. The cubic root of 19968489 is about 271.2991300363.

The spelling of 19968489 in words is "nineteen million, nine hundred sixty-eight thousand, four hundred eighty-nine".