22381642 has 4 divisors (see below), whose sum is σ = 33572466. Its totient is φ = 11190820.

The previous prime is 22381627. The next prime is 22381643. The reversal of 22381642 is 24618322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21893041 + 488601 = 4679^2 + 699^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22381642.

It is not an unprimeable number, because it can be changed into a prime (22381643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5595409 + ... + 5595412.

Almost surely, 2^22381642 is an apocalyptic number.

22381642 is a deficient number, since it is larger than the sum of its proper divisors (11190824).

22381642 is a wasteful number, since it uses less digits than its factorization.

22381642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11190823.

The product of its digits is 4608, while the sum is 28.

The square root of 22381642 is about 4730.9240112266. The cubic root of 22381642 is about 281.8149197175.

Adding to 22381642 its reverse (24618322), we get a palindrome (46999964).

The spelling of 22381642 in words is "twenty-two million, three hundred eighty-one thousand, six hundred forty-two".