18814518 has 24 divisors (see below), whose sum is σ = 42275688. Its totient is φ = 6271344.

The previous prime is 18814513. The next prime is 18814571. The reversal of 18814518 is 81541881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18814513) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 18871 + ... + 19842.

It is an arithmetic number, because the mean of its divisors is an integer number (1761487).

Almost surely, 2^18814518 is an apocalyptic number.

18814518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18814518 is an abundant number, since it is smaller than the sum of its proper divisors (23461170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18814518 is an equidigital number, since it uses as much as digits as its factorization.

18814518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38730 (or 38718 counting only the distinct ones).

The product of its digits is 10240, while the sum is 36.

The square root of 18814518 is about 4337.5705181588. The cubic root of 18814518 is about 265.9690072621.

It can be divided in two parts, 188 and 14518, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 18814518 in words is "eighteen million, eight hundred fourteen thousand, five hundred eighteen".