22440491 has 2 divisors, whose sum is σ = 22440492. Its totient is φ = 22440490.

The previous prime is 22440487. The next prime is 22440499. The reversal of 22440491 is 19404422.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22440491 - 2² = 22440487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22440491.

It is not a weakly prime, because it can be changed into another prime (22440499) 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 as a sum of consecutive naturals, namely, 11220245 + 11220246.

It is an arithmetic number, because the mean of its divisors is an integer number (11220246).

Almost surely, 2^22440491 is an apocalyptic number.

22440491 is a deficient number, since it is larger than the sum of its proper divisors (1).

22440491 is an equidigital number, since it uses as much as digits as its factorization.

22440491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 22440491 is about 4737.1395377379. The cubic root of 22440491 is about 282.0616995255.

The spelling of 22440491 in words is "twenty-two million, four hundred forty thousand, four hundred ninety-one".