18748559 has 4 divisors (see below), whose sum is σ = 19184616. Its totient is φ = 18312504.

The previous prime is 18748549. The next prime is 18748567. The reversal of 18748559 is 95584781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95584781 = 443 ⋅215767.

It is a cyclic number.

It is not a de Polignac number, because 18748559 - 2¹² = 18744463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18748549) 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, 217964 + ... + 218049.

It is an arithmetic number, because the mean of its divisors is an integer number (4796154).

Almost surely, 2^18748559 is an apocalyptic number.

18748559 is a deficient number, since it is larger than the sum of its proper divisors (436057).

18748559 is an equidigital number, since it uses as much as digits as its factorization.

18748559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436056.

The product of its digits is 403200, while the sum is 47.

The square root of 18748559 is about 4329.9606233775. The cubic root of 18748559 is about 265.6578363835.

The spelling of 18748559 in words is "eighteen million, seven hundred forty-eight thousand, five hundred fifty-nine".