18672089 has 4 divisors (see below), whose sum is σ = 18697140. Its totient is φ = 18647040.

The previous prime is 18672053. The next prime is 18672107. The reversal of 18672089 is 98027681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98027681 = 2287 ⋅42863.

It can be written as a sum of positive squares in 2 ways, for example, as 13564489 + 5107600 = 3683^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 18672089 - 2⁸ = 18671833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18677089) 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, 11372 + ... + 12909.

It is an arithmetic number, because the mean of its divisors is an integer number (4674285).

Almost surely, 2^18672089 is an apocalyptic number.

It is an amenable number.

18672089 is a deficient number, since it is larger than the sum of its proper divisors (25051).

18672089 is an equidigital number, since it uses as much as digits as its factorization.

18672089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25050.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 18672089 is about 4321.1212665233. The cubic root of 18672089 is about 265.2961634856.

The spelling of 18672089 in words is "eighteen million, six hundred seventy-two thousand, eighty-nine".