18819089 has 4 divisors (see below), whose sum is σ = 18829824. Its totient is φ = 18808356.

The previous prime is 18819061. The next prime is 18819107. The reversal of 18819089 is 98091881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18819089 is a prime.

It is a super-2 number, since 2×18819089² = 708316221579842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18819019) 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, 2057 + ... + 6470.

It is an arithmetic number, because the mean of its divisors is an integer number (4707456).

Almost surely, 2^18819089 is an apocalyptic number.

It is an amenable number.

18819089 is a deficient number, since it is larger than the sum of its proper divisors (10735).

18819089 is an equidigital number, since it uses as much as digits as its factorization.

18819089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10734.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 18819089 is about 4338.0973940196. The cubic root of 18819089 is about 265.9905446354.

The spelling of 18819089 in words is "eighteen million, eight hundred nineteen thousand, eighty-nine".