18748999 has 4 divisors (see below), whose sum is σ = 18798336. Its totient is φ = 18699664.

The previous prime is 18748967. The next prime is 18749009. The reversal of 18748999 is 99984781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99984781 = 13 ⋅7691137.

It is a cyclic number.

It is not a de Polignac number, because 18748999 - 2⁵ = 18748967 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 (18748949) 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, 24094 + ... + 24859.

It is an arithmetic number, because the mean of its divisors is an integer number (4699584).

Almost surely, 2^18748999 is an apocalyptic number.

18748999 is a deficient number, since it is larger than the sum of its proper divisors (49337).

18748999 is an equidigital number, since it uses as much as digits as its factorization.

18748999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49336.

The product of its digits is 1306368, while the sum is 55.

The square root of 18748999 is about 4330.0114318556. The cubic root of 18748999 is about 265.6599145616.

The spelling of 18748999 in words is "eighteen million, seven hundred forty-eight thousand, nine hundred ninety-nine".