18213202 has 12 divisors (see below), whose sum is σ = 31780350. Its totient is φ = 7805616.

The previous prime is 18213199. The next prime is 18213203. The reversal of 18213202 is 20231281.

It can be written as a sum of positive squares in only one way, i.e., 18054001 + 159201 = 4249^2 + 399^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18213202.

It is not an unprimeable number, because it can be changed into a prime (18213203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92827 + ... + 93022.

Almost surely, 2^18213202 is an apocalyptic number.

18213202 is a deficient number, since it is larger than the sum of its proper divisors (13567148).

18213202 is a wasteful number, since it uses less digits than its factorization.

18213202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185865 (or 185858 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 18213202 is about 4267.6928193112. The cubic root of 18213202 is about 263.1047980721.

Adding to 18213202 its reverse (20231281), we get a palindrome (38444483).

The spelling of 18213202 in words is "eighteen million, two hundred thirteen thousand, two hundred two".