18059989 has 4 divisors (see below), whose sum is σ = 18164556. Its totient is φ = 17955424.

The previous prime is 18059983. The next prime is 18060017. The reversal of 18059989 is 98995081.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17497489 + 562500 = 4183^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 18059989 - 2²³ = 9671381 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 (18059983) 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, 52024 + ... + 52369.

It is an arithmetic number, because the mean of its divisors is an integer number (4541139).

Almost surely, 2^18059989 is an apocalyptic number.

It is an amenable number.

18059989 is a deficient number, since it is larger than the sum of its proper divisors (104567).

18059989 is a wasteful number, since it uses less digits than its factorization.

18059989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104566.

The product of its (nonzero) digits is 233280, while the sum is 49.

The square root of 18059989 is about 4249.7045779677. The cubic root of 18059989 is about 262.3649566915.

The spelling of 18059989 in words is "eighteen million, fifty-nine thousand, nine hundred eighty-nine".