18212406 has 64 divisors (see below), whose sum is σ = 41057280. Its totient is φ = 5358080.

The previous prime is 18212387. The next prime is 18212417. The reversal of 18212406 is 60421281.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 138961 + ... + 139091.

It is an arithmetic number, because the mean of its divisors is an integer number (641520).

Almost surely, 2^18212406 is an apocalyptic number.

18212406 is an abundant number, since it is smaller than the sum of its proper divisors (22844874).

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

18212406 is a wasteful number, since it uses less digits than its factorization.

18212406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 18212406 is about 4267.5995594713. The cubic root of 18212406 is about 263.1009650564.

Adding to 18212406 its reverse (60421281), we get a palindrome (78633687).

The spelling of 18212406 in words is "eighteen million, two hundred twelve thousand, four hundred six".