22405247 has 2 divisors, whose sum is σ = 22405248. Its totient is φ = 22405246.

The previous prime is 22405241. The next prime is 22405249. The reversal of 22405247 is 74250422.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22405247 - 2⁴ = 22405231 is a prime.

Together with 22405249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22405241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11202623 + 11202624.

It is an arithmetic number, because the mean of its divisors is an integer number (11202624).

Almost surely, 2^22405247 is an apocalyptic number.

22405247 is a deficient number, since it is larger than the sum of its proper divisors (1).

22405247 is an equidigital number, since it uses as much as digits as its factorization.

22405247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 22405247 is about 4733.4181095694. The cubic root of 22405247 is about 281.9139577883.

Adding to 22405247 its reverse (74250422), we get a palindrome (96655669).

The spelling of 22405247 in words is "twenty-two million, four hundred five thousand, two hundred forty-seven".