22147747 has 4 divisors (see below), whose sum is σ = 22157280. Its totient is φ = 22138216.

The previous prime is 22147717. The next prime is 22147751. The reversal of 22147747 is 74774122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22147747 - 2¹⁵ = 22114979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22147717) 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 3 ways as a sum of consecutive naturals, for example, 1254 + ... + 6772.

It is an arithmetic number, because the mean of its divisors is an integer number (5539320).

Almost surely, 2^22147747 is an apocalyptic number.

22147747 is a deficient number, since it is larger than the sum of its proper divisors (9533).

22147747 is an equidigital number, since it uses as much as digits as its factorization.

22147747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9532.

The product of its digits is 21952, while the sum is 34.

The square root of 22147747 is about 4706.1392882064. The cubic root of 22147747 is about 280.8297960755.

The spelling of 22147747 in words is "twenty-two million, one hundred forty-seven thousand, seven hundred forty-seven".