18800889 has 4 divisors (see below), whose sum is σ = 25067856. Its totient is φ = 12533924.

The previous prime is 18800879. The next prime is 18800897. The reversal of 18800889 is 98800881.

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 an emirpimes, since its reverse is a distinct semiprime: 98800881 = 3 ⋅32933627.

It is a cyclic number.

It is not a de Polignac number, because 18800889 - 2⁵ = 18800857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18800889.

It is not an unprimeable number, because it can be changed into a prime (18800809) 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, 3133479 + ... + 3133484.

It is an arithmetic number, because the mean of its divisors is an integer number (6266964).

Almost surely, 2^18800889 is an apocalyptic number.

It is an amenable number.

18800889 is a deficient number, since it is larger than the sum of its proper divisors (6266967).

18800889 is an equidigital number, since it uses as much as digits as its factorization.

18800889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6266966.

The product of its (nonzero) digits is 36864, while the sum is 42.

The square root of 18800889 is about 4335.9991928044. Note that the first 3 decimals coincide. The cubic root of 18800889 is about 265.9047702152.

The spelling of 18800889 in words is "eighteen million, eight hundred thousand, eight hundred eighty-nine".