18989759 has 8 divisors (see below), whose sum is σ = 20039040. Its totient is φ = 17945496.

The previous prime is 18989713. The next prime is 18989767. The reversal of 18989759 is 95798981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18989759 is a prime.

It is a super-2 number, since 2×18989759² = 721221893756162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18989779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8564 + ... + 10550.

It is an arithmetic number, because the mean of its divisors is an integer number (2504880).

Almost surely, 2^18989759 is an apocalyptic number.

18989759 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18989759 is a deficient number, since it is larger than the sum of its proper divisors (1049281).

18989759 is a wasteful number, since it uses less digits than its factorization.

18989759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509.

The product of its digits is 1632960, while the sum is 56.

The square root of 18989759 is about 4357.7240619388. The cubic root of 18989759 is about 266.7922139730.

The spelling of 18989759 in words is "eighteen million, nine hundred eighty-nine thousand, seven hundred fifty-nine".