22840145 has 4 divisors (see below), whose sum is σ = 27408180. Its totient is φ = 18272112.

The previous prime is 22840141. The next prime is 22840171. The reversal of 22840145 is 54104822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54104822 = 2 ⋅27052411.

It can be written as a sum of positive squares in 2 ways, for example, as 5166529 + 17673616 = 2273^2 + 4204^2 .

It is a cyclic number.

It is not a de Polignac number, because 22840145 - 2² = 22840141 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22840141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2284010 + ... + 2284019.

It is an arithmetic number, because the mean of its divisors is an integer number (6852045).

Almost surely, 2^22840145 is an apocalyptic number.

It is an amenable number.

22840145 is a deficient number, since it is larger than the sum of its proper divisors (4568035).

22840145 is an equidigital number, since it uses as much as digits as its factorization.

22840145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4568034.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 22840145 is about 4779.1364282682. The cubic root of 22840145 is about 283.7263158895.

Adding to 22840145 its reverse (54104822), we get a palindrome (76944967).

The spelling of 22840145 in words is "twenty-two million, eight hundred forty thousand, one hundred forty-five".