18049523 has 4 divisors (see below), whose sum is σ = 18061248. Its totient is φ = 18037800.

The previous prime is 18049517. The next prime is 18049531. The reversal of 18049523 is 32594081.

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 is a cyclic number.

It is not a de Polignac number, because 18049523 - 2⁸ = 18049267 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 18049523.

It is not an unprimeable number, because it can be changed into a prime (18049543) 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, 3128 + ... + 6773.

It is an arithmetic number, because the mean of its divisors is an integer number (4515312).

Almost surely, 2^18049523 is an apocalyptic number.

18049523 is a deficient number, since it is larger than the sum of its proper divisors (11725).

18049523 is an equidigital number, since it uses as much as digits as its factorization.

18049523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11724.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 18049523 is about 4248.4730198037. The cubic root of 18049523 is about 262.3142655894.

The spelling of 18049523 in words is "eighteen million, forty-nine thousand, five hundred twenty-three".