18808743 has 4 divisors (see below), whose sum is σ = 25078328. Its totient is φ = 12539160.

The previous prime is 18808739. The next prime is 18808753. The reversal of 18808743 is 34780881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34780881 = 3 ⋅11593627.

It is not a de Polignac number, because 18808743 - 2² = 18808739 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 (18808703) 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, 3134788 + ... + 3134793.

It is an arithmetic number, because the mean of its divisors is an integer number (6269582).

Almost surely, 2^18808743 is an apocalyptic number.

18808743 is a deficient number, since it is larger than the sum of its proper divisors (6269585).

18808743 is an equidigital number, since it uses as much as digits as its factorization.

18808743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6269584.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 18808743 is about 4336.9047718390. The cubic root of 18808743 is about 265.9417919631.

The spelling of 18808743 in words is "eighteen million, eight hundred eight thousand, seven hundred forty-three".