18212562 has 48 divisors (see below), whose sum is σ = 41213952. Its totient is φ = 5806080.

The previous prime is 18212561. The next prime is 18212617. The reversal of 18212562 is 26521281.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18212561) 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 23 ways as a sum of consecutive naturals, for example, 70738 + ... + 70994.

It is an arithmetic number, because the mean of its divisors is an integer number (858624).

Almost surely, 2^18212562 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18212562, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20606976).

18212562 is an abundant number, since it is smaller than the sum of its proper divisors (23001390).

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

18212562 is a wasteful number, since it uses less digits than its factorization.

18212562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 420 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 18212562 is about 4267.6178366859. The cubic root of 18212562 is about 263.1017162592.

The spelling of 18212562 in words is "eighteen million, two hundred twelve thousand, five hundred sixty-two".