18915349 has 4 divisors (see below), whose sum is σ = 19011564. Its totient is φ = 18819136.

The previous prime is 18915343. The next prime is 18915359. The reversal of 18915349 is 94351981.

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 10400625 + 8514724 = 3225^2 + 2918^2 .

It is a cyclic number.

It is not a de Polignac number, because 18915349 - 2¹³ = 18907157 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18915343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47812 + ... + 48205.

It is an arithmetic number, because the mean of its divisors is an integer number (4752891).

Almost surely, 2^18915349 is an apocalyptic number.

It is an amenable number.

18915349 is a deficient number, since it is larger than the sum of its proper divisors (96215).

18915349 is an equidigital number, since it uses as much as digits as its factorization.

18915349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96214.

The product of its digits is 38880, while the sum is 40.

The square root of 18915349 is about 4349.1779683062. The cubic root of 18915349 is about 266.4432891518.

The spelling of 18915349 in words is "eighteen million, nine hundred fifteen thousand, three hundred forty-nine".