18237089 has 8 divisors (see below), whose sum is σ = 19697832. Its totient is φ = 16784640.

The previous prime is 18237047. The next prime is 18237103. The reversal of 18237089 is 98073281.

It can be written as a sum of positive squares in 4 ways, for example, as 664225 + 17572864 = 815^2 + 4192^2 .

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 18237089 - 2⁸ = 18236833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18237589) 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, 2969 + ... + 6729.

It is an arithmetic number, because the mean of its divisors is an integer number (2462229).

Almost surely, 2^18237089 is an apocalyptic number.

It is an amenable number.

18237089 is a deficient number, since it is larger than the sum of its proper divisors (1460743).

18237089 is a wasteful number, since it uses less digits than its factorization.

18237089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4147.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 18237089 is about 4270.4904870518. The cubic root of 18237089 is about 263.2197703281.

The spelling of 18237089 in words is "eighteen million, two hundred thirty-seven thousand, eighty-nine".