18212202 has 60 divisors (see below), whose sum is σ = 43461990. Its totient is φ = 5698944.

The previous prime is 18212191. The next prime is 18212209. The reversal of 18212202 is 20221281.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 17214201 + 998001 = 4149^2 + 999^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (18212209) 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 29 ways as a sum of consecutive naturals, for example, 46624 + ... + 47012.

Almost surely, 2^18212202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18212202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21730995).

18212202 is an abundant number, since it is smaller than the sum of its proper divisors (25249788).

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

18212202 is a wasteful number, since it uses less digits than its factorization.

18212202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 18212202 is about 4267.5756583803. The cubic root of 18212202 is about 263.0999827077.

Adding to 18212202 its reverse (20221281), we get a palindrome (38433483).

The spelling of 18212202 in words is "eighteen million, two hundred twelve thousand, two hundred two".