18996523 has 16 divisors (see below), whose sum is σ = 24613120. Its totient is φ = 14237856.

The previous prime is 18996473. The next prime is 18996539. The reversal of 18996523 is 32569981.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18996523 - 2⁹ = 18996011 is a prime.

It is the 4359-th Hogben number.

It is a self number, because there is not a number n which added to its sum of digits gives 18996523.

It is not an unprimeable number, because it can be changed into a prime (18996553) by changing a digit.

It is a nontrivial repunit in base 4358.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3765 + ... + 7222.

It is an arithmetic number, because the mean of its divisors is an integer number (1538320).

Almost surely, 2^18996523 is an apocalyptic number.

18996523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18996523 is a deficient number, since it is larger than the sum of its proper divisors (5616597).

18996523 is a wasteful number, since it uses less digits than its factorization.

18996523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11026.

The product of its digits is 116640, while the sum is 43.

The square root of 18996523 is about 4358.5000860388. The cubic root of 18996523 is about 266.8238866291.

The spelling of 18996523 in words is "eighteen million, nine hundred ninety-six thousand, five hundred twenty-three".