18148989 has 8 divisors (see below), whose sum is σ = 24334560. Its totient is φ = 12031376.

The previous prime is 18148973. The next prime is 18149017. The reversal of 18148989 is 98984181.

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 18148989 - 2⁴ = 18148973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18148939) 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, 16362 + ... + 17435.

It is an arithmetic number, because the mean of its divisors is an integer number (3041820).

Almost surely, 2^18148989 is an apocalyptic number.

It is an amenable number.

18148989 is a deficient number, since it is larger than the sum of its proper divisors (6185571).

18148989 is a wasteful number, since it uses less digits than its factorization.

18148989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33979.

The product of its digits is 165888, while the sum is 48.

The square root of 18148989 is about 4260.1630250496. The cubic root of 18148989 is about 262.7952306449.

The spelling of 18148989 in words is "eighteen million, one hundred forty-eight thousand, nine hundred eighty-nine".