18584989 has 8 divisors (see below), whose sum is σ = 19918080. Its totient is φ = 17295696.

The previous prime is 18584981. The next prime is 18584999. The reversal of 18584989 is 98948581.

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 18584989 - 2³ = 18584981 is a prime.

It is a super-2 number, since 2×18584989² = 690803632260242, 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 (18584981) 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, 10069 + ... + 11770.

It is an arithmetic number, because the mean of its divisors is an integer number (2489760).

Almost surely, 2^18584989 is an apocalyptic number.

It is an amenable number.

18584989 is a deficient number, since it is larger than the sum of its proper divisors (1333091).

18584989 is a wasteful number, since it uses less digits than its factorization.

18584989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21899.

The product of its digits is 829440, while the sum is 52.

The square root of 18584989 is about 4311.0310831633. The cubic root of 18584989 is about 264.8830099475.

The spelling of 18584989 in words is "eighteen million, five hundred eighty-four thousand, nine hundred eighty-nine".