22407281 has 4 divisors (see below), whose sum is σ = 24130932. Its totient is φ = 20683632.

The previous prime is 22407271. The next prime is 22407293. The reversal of 22407281 is 18270422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18270422 = 2 ⋅9135211.

It can be written as a sum of positive squares in 2 ways, for example, as 2202256 + 20205025 = 1484^2 + 4495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22407281 is a prime.

It is a super-2 number, since 2×22407281² = 1004172483625922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22407281.

It is not an unprimeable number, because it can be changed into a prime (22407211) 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, 861806 + ... + 861831.

It is an arithmetic number, because the mean of its divisors is an integer number (6032733).

Almost surely, 2^22407281 is an apocalyptic number.

It is an amenable number.

22407281 is a deficient number, since it is larger than the sum of its proper divisors (1723651).

22407281 is a wasteful number, since it uses less digits than its factorization.

22407281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723650.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 22407281 is about 4733.6329600002. The cubic root of 22407281 is about 281.9224884633.

The spelling of 22407281 in words is "twenty-two million, four hundred seven thousand, two hundred eighty-one".