18886989 has 8 divisors (see below), whose sum is σ = 27472032. Its totient is φ = 11446640.

The previous prime is 18886963. The next prime is 18887009. The reversal of 18886989 is 98968881.

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

It is a cyclic number.

It is not a de Polignac number, because 18886989 - 2¹¹ = 18884941 is a prime.

It is a super-2 number, since 2×18886989² = 713436706972242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18886939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286134 + ... + 286199.

It is an arithmetic number, because the mean of its divisors is an integer number (3434004).

Almost surely, 2^18886989 is an apocalyptic number.

It is an amenable number.

18886989 is a deficient number, since it is larger than the sum of its proper divisors (8585043).

18886989 is a wasteful number, since it uses less digits than its factorization.

18886989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572347.

The product of its digits is 1990656, while the sum is 57.

The square root of 18886989 is about 4345.9163590663. The cubic root of 18886989 is about 266.3100620522.

The spelling of 18886989 in words is "eighteen million, eight hundred eighty-six thousand, nine hundred eighty-nine".