18849718 has 4 divisors (see below), whose sum is σ = 28274580. Its totient is φ = 9424858.

The previous prime is 18849707. The next prime is 18849749. The reversal of 18849718 is 81794881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81794881 = 7 ⋅11684983.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4712428 + ... + 4712431.

It is an arithmetic number, because the mean of its divisors is an integer number (7068645).

Almost surely, 2^18849718 is an apocalyptic number.

18849718 is a deficient number, since it is larger than the sum of its proper divisors (9424862).

18849718 is an equidigital number, since it uses as much as digits as its factorization.

18849718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9424861.

The product of its digits is 129024, while the sum is 46.

The square root of 18849718 is about 4341.6261930295. The cubic root of 18849718 is about 266.1347706831.

The spelling of 18849718 in words is "eighteen million, eight hundred forty-nine thousand, seven hundred eighteen".