18899911 has 4 divisors (see below), whose sum is σ = 18998032. Its totient is φ = 18801792.

The previous prime is 18899899. The next prime is 18899917. The reversal of 18899911 is 11999881.

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 18899911 - 2¹⁵ = 18867143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18899917) 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 3 ways as a sum of consecutive naturals, for example, 48771 + ... + 49156.

It is an arithmetic number, because the mean of its divisors is an integer number (4749508).

Almost surely, 2^18899911 is an apocalyptic number.

18899911 is a deficient number, since it is larger than the sum of its proper divisors (98121).

18899911 is an equidigital number, since it uses as much as digits as its factorization.

18899911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98120.

The product of its digits is 46656, while the sum is 46.

The square root of 18899911 is about 4347.4027878723. The cubic root of 18899911 is about 266.3707824086.

The spelling of 18899911 in words is "eighteen million, eight hundred ninety-nine thousand, nine hundred eleven".