18481849 has 4 divisors (see below), whose sum is σ = 18492660. Its totient is φ = 18471040.

The previous prime is 18481843. The next prime is 18481861. The reversal of 18481849 is 94818481.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10112400 + 8369449 = 3180^2 + 2893^2 .

It is a cyclic number.

It is not a de Polignac number, because 18481849 - 2⁷ = 18481721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18481843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2212 + ... + 6469.

It is an arithmetic number, because the mean of its divisors is an integer number (4623165).

Almost surely, 2^18481849 is an apocalyptic number.

It is an amenable number.

18481849 is a deficient number, since it is larger than the sum of its proper divisors (10811).

18481849 is an equidigital number, since it uses as much as digits as its factorization.

18481849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10810.

The product of its digits is 73728, while the sum is 43.

The square root of 18481849 is about 4299.0521048250. The cubic root of 18481849 is about 264.3920989077.

The spelling of 18481849 in words is "eighteen million, four hundred eighty-one thousand, eight hundred forty-nine".