18818406 has 28 divisors (see below), whose sum is σ = 42325332. Its totient is φ = 6272316.

The previous prime is 18818399. The next prime is 18818407. The reversal of 18818406 is 60481881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18818407) 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 13 ways as a sum of consecutive naturals, for example, 4996 + ... + 7911.

It is an arithmetic number, because the mean of its divisors is an integer number (1511619).

Almost surely, 2^18818406 is an apocalyptic number.

18818406 is an abundant number, since it is smaller than the sum of its proper divisors (23506926).

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

18818406 is an equidigital number, since it uses as much as digits as its factorization.

18818406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12927 (or 12912 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 18818406 is about 4338.0186721590. The cubic root of 18818406 is about 265.9873267371.

The spelling of 18818406 in words is "eighteen million, eight hundred eighteen thousand, four hundred six".