18789899 has 4 divisors (see below), whose sum is σ = 18831120. Its totient is φ = 18748680.

The previous prime is 18789893. The next prime is 18789923. The reversal of 18789899 is 99898781.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18789899 - 2¹² = 18785803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18789893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19919 + ... + 20840.

It is an arithmetic number, because the mean of its divisors is an integer number (4707780).

Almost surely, 2^18789899 is an apocalyptic number.

18789899 is a deficient number, since it is larger than the sum of its proper divisors (41221).

18789899 is an equidigital number, since it uses as much as digits as its factorization.

18789899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41220.

The product of its digits is 2612736, while the sum is 59.

The square root of 18789899 is about 4334.7317102677. The cubic root of 18789899 is about 265.8529488533.

The spelling of 18789899 in words is "eighteen million, seven hundred eighty-nine thousand, eight hundred ninety-nine".