22491986 has 16 divisors (see below), whose sum is σ = 38970720. Its totient is φ = 9622080.

The previous prime is 22491983. The next prime is 22492009. The reversal of 22491986 is 68919422.

It is not an unprimeable number, because it can be changed into a prime (22491983) 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 7 ways as a sum of consecutive naturals, for example, 29696 + ... + 30443.

It is an arithmetic number, because the mean of its divisors is an integer number (2435670).

Almost surely, 2^22491986 is an apocalyptic number.

22491986 is a deficient number, since it is larger than the sum of its proper divisors (16478734).

22491986 is a wasteful number, since it uses less digits than its factorization.

22491986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60169.

The product of its digits is 62208, while the sum is 41.

The square root of 22491986 is about 4742.5716652466. The cubic root of 22491986 is about 282.2772870720.

The spelling of 22491986 in words is "twenty-two million, four hundred ninety-one thousand, nine hundred eighty-six".