18724089 has 8 divisors (see below), whose sum is σ = 26434080. Its totient is φ = 11748416.

The previous prime is 18724081. The next prime is 18724091. The reversal of 18724089 is 98042781.

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 18724089 - 2³ = 18724081 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18724081) 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, 183519 + ... + 183620.

It is an arithmetic number, because the mean of its divisors is an integer number (3304260).

Almost surely, 2^18724089 is an apocalyptic number.

It is an amenable number.

18724089 is a deficient number, since it is larger than the sum of its proper divisors (7709991).

18724089 is a wasteful number, since it uses less digits than its factorization.

18724089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367159.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 18724089 is about 4327.1340399854. The cubic root of 18724089 is about 265.5422101203.

The spelling of 18724089 in words is "eighteen million, seven hundred twenty-four thousand, eighty-nine".