18650889 has 6 divisors (see below), whose sum is σ = 26940186. Its totient is φ = 12433920.

The previous prime is 18650867. The next prime is 18650893. The reversal of 18650889 is 98805681.

It can be written as a sum of positive squares in only one way, i.e., 18636489 + 14400 = 4317^2 + 120^2 .

It is not a de Polignac number, because 18650889 - 2⁸ = 18650633 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18650899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1036152 + ... + 1036169.

It is an arithmetic number, because the mean of its divisors is an integer number (4490031).

Almost surely, 2^18650889 is an apocalyptic number.

It is an amenable number.

18650889 is a deficient number, since it is larger than the sum of its proper divisors (8289297).

18650889 is a wasteful number, since it uses less digits than its factorization.

18650889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072327 (or 2072324 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 18650889 is about 4318.6675028300. The cubic root of 18650889 is about 265.1957210805.

The spelling of 18650889 in words is "eighteen million, six hundred fifty thousand, eight hundred eighty-nine".