18075989 has 8 divisors (see below), whose sum is σ = 18506880. Its totient is φ = 17650336.

The previous prime is 18075949. The next prime is 18075991. The reversal of 18075989 is 98957081.

18075989 = 226² + 227² + ... + 403².

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 a de Polignac number, because none of the positive numbers 2^k-18075989 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 (18075919) 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, 6164 + ... + 8610.

It is an arithmetic number, because the mean of its divisors is an integer number (2313360).

Almost surely, 2^18075989 is an apocalyptic number.

It is an amenable number.

18075989 is a deficient number, since it is larger than the sum of its proper divisors (430891).

18075989 is an equidigital number, since it uses as much as digits as its factorization.

18075989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 18075989 is about 4251.5866450068. The cubic root of 18075989 is about 262.4424133692.

The spelling of 18075989 in words is "eighteen million, seventy-five thousand, nine hundred eighty-nine".