18848991 has 8 divisors (see below), whose sum is σ = 28722304. Its totient is φ = 10770840.

The previous prime is 18848989. The next prime is 18849011. The reversal of 18848991 is 19984881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18848991 - 2¹ = 18848989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18848991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18848911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448765 + ... + 448806.

It is an arithmetic number, because the mean of its divisors is an integer number (3590288).

Almost surely, 2^18848991 is an apocalyptic number.

18848991 is a deficient number, since it is larger than the sum of its proper divisors (9873313).

18848991 is an equidigital number, since it uses as much as digits as its factorization.

18848991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897581.

The product of its digits is 165888, while the sum is 48.

The square root of 18848991 is about 4341.5424678333. The cubic root of 18848991 is about 266.1313491914.

The spelling of 18848991 in words is "eighteen million, eight hundred forty-eight thousand, nine hundred ninety-one".