12201642 has 24 divisors (see below), whose sum is σ = 26506116. Its totient is φ = 4056576.

The previous prime is 12201619. The next prime is 12201643. The reversal of 12201642 is 24610221.

12201642 is a `hidden beast` number, since 1 + 2 + 20 + 1 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10949481 + 1252161 = 3309^2 + 1119^2 .

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 (12201643) 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 11 ways as a sum of consecutive naturals, for example, 9418 + ... + 10634.

Almost surely, 2^12201642 is an apocalyptic number.

12201642 is an abundant number, since it is smaller than the sum of its proper divisors (14304474).

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

12201642 is a wasteful number, since it uses less digits than its factorization.

12201642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782 (or 1779 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 12201642 is about 3493.0848830225. The cubic root of 12201642 is about 230.2180792327.

Adding to 12201642 its reverse (24610221), we get a palindrome (36811863).

The spelling of 12201642 in words is "twelve million, two hundred one thousand, six hundred forty-two".