18948805 has 4 divisors (see below), whose sum is σ = 22738572. Its totient is φ = 15159040.

The previous prime is 18948799. The next prime is 18948821. The reversal of 18948805 is 50884981.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6880129 + 12068676 = 2623^2 + 3474^2 .

It is not a de Polignac number, because 18948805 - 2¹¹ = 18946757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1894876 + ... + 1894885.

It is an arithmetic number, because the mean of its divisors is an integer number (5684643).

Almost surely, 2^18948805 is an apocalyptic number.

It is an amenable number.

18948805 is a deficient number, since it is larger than the sum of its proper divisors (3789767).

18948805 is an equidigital number, since it uses as much as digits as its factorization.

18948805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3789766.

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 18948805 is about 4353.0225131511. The cubic root of 18948805 is about 266.6002846920.

The spelling of 18948805 in words is "eighteen million, nine hundred forty-eight thousand, eight hundred five".