22187722 has 4 divisors (see below), whose sum is σ = 33281586. Its totient is φ = 11093860.

The previous prime is 22187707. The next prime is 22187729. The reversal of 22187722 is 22778122.

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., 19527561 + 2660161 = 4419^2 + 1631^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (22187729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5546929 + ... + 5546932.

Almost surely, 2^22187722 is an apocalyptic number.

22187722 is a deficient number, since it is larger than the sum of its proper divisors (11093864).

22187722 is a wasteful number, since it uses less digits than its factorization.

22187722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11093863.

The product of its digits is 6272, while the sum is 31.

The square root of 22187722 is about 4710.3844853685. The cubic root of 22187722 is about 280.9986533372.

The spelling of 22187722 in words is "twenty-two million, one hundred eighty-seven thousand, seven hundred twenty-two".