18662989 has 8 divisors (see below), whose sum is σ = 19369152. Its totient is φ = 17969280.

The previous prime is 18662983. The next prime is 18662993. The reversal of 18662989 is 98926681.

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 not a de Polignac number, because 18662989 - 2³ = 18662981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18662981) 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, 4 + ... + 6109.

It is an arithmetic number, because the mean of its divisors is an integer number (2421144).

Almost surely, 2^18662989 is an apocalyptic number.

It is an amenable number.

18662989 is a deficient number, since it is larger than the sum of its proper divisors (706163).

18662989 is an equidigital number, since it uses as much as digits as its factorization.

18662989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6227.

The product of its digits is 373248, while the sum is 49.

The square root of 18662989 is about 4320.0681707584. The cubic root of 18662989 is about 265.2530583750.

The spelling of 18662989 in words is "eighteen million, six hundred sixty-two thousand, nine hundred eighty-nine".