18181814 has 16 divisors (see below), whose sum is σ = 31546368. Its totient is φ = 7697832.

The previous prime is 18181783. The next prime is 18181817. The reversal of 18181814 is 41818181.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18181817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6662 + ... + 8985.

It is an arithmetic number, because the mean of its divisors is an integer number (1971648).

Almost surely, 2^18181814 is an apocalyptic number.

18181814 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18181814 is a deficient number, since it is larger than the sum of its proper divisors (13364554).

18181814 is a wasteful number, since it uses less digits than its factorization.

18181814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15739.

The product of its digits is 2048, while the sum is 32.

The square root of 18181814 is about 4264.0138367505. The cubic root of 18181814 is about 262.9535692732.

Adding to 18181814 its reverse (41818181), we get a palindrome (59999995).

It can be divided in two parts, 181818 and 14, that multiplied together give a palindrome (2545452).

The spelling of 18181814 in words is "eighteen million, one hundred eighty-one thousand, eight hundred fourteen".