18234989 has 4 divisors (see below), whose sum is σ = 18246624. Its totient is φ = 18223356.

The previous prime is 18234977. The next prime is 18235027. The reversal of 18234989 is 98943281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18234989 - 2¹² = 18230893 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 (18234089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3017 + ... + 6750.

It is an arithmetic number, because the mean of its divisors is an integer number (4561656).

Almost surely, 2^18234989 is an apocalyptic number.

It is an amenable number.

18234989 is a deficient number, since it is larger than the sum of its proper divisors (11635).

18234989 is an equidigital number, since it uses as much as digits as its factorization.

18234989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11634.

The product of its digits is 124416, while the sum is 44.

The square root of 18234989 is about 4270.2446065770. The cubic root of 18234989 is about 263.2096666920.

The spelling of 18234989 in words is "eighteen million, two hundred thirty-four thousand, nine hundred eighty-nine".