18816418 has 16 divisors (see below), whose sum is σ = 29304000. Its totient is φ = 9050832.

The previous prime is 18816409. The next prime is 18816419. The reversal of 18816418 is 81461881.

It is not an unprimeable number, because it can be changed into a prime (18816419) 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 7 ways as a sum of consecutive naturals, for example, 25093 + ... + 25831.

It is an arithmetic number, because the mean of its divisors is an integer number (1831500).

Almost surely, 2^18816418 is an apocalyptic number.

18816418 is a deficient number, since it is larger than the sum of its proper divisors (10487582).

18816418 is a wasteful number, since it uses less digits than its factorization.

18816418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209.

The product of its digits is 12288, while the sum is 37.

The square root of 18816418 is about 4337.7895292418. The cubic root of 18816418 is about 265.9779599957.

The spelling of 18816418 in words is "eighteen million, eight hundred sixteen thousand, four hundred eighteen".