22394881 has 4 divisors (see below), whose sum is σ = 22404564. Its totient is φ = 22385200.

The previous prime is 22394861. The next prime is 22394909. The reversal of 22394881 is 18849322.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18849322 = 2 ⋅9424661.

It can be written as a sum of positive squares in 2 ways, for example, as 15681600 + 6713281 = 3960^2 + 2591^2 .

It is a cyclic number.

It is not a de Polignac number, because 22394881 - 2¹¹ = 22392833 is a prime.

It is a super-2 number, since 2×22394881² = 1003061390008322, 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 22394881.

It is not an unprimeable number, because it can be changed into a prime (22394851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 891 + ... + 6751.

It is an arithmetic number, because the mean of its divisors is an integer number (5601141).

Almost surely, 2^22394881 is an apocalyptic number.

It is an amenable number.

22394881 is a deficient number, since it is larger than the sum of its proper divisors (9683).

22394881 is an equidigital number, since it uses as much as digits as its factorization.

22394881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9682.

The product of its digits is 27648, while the sum is 37.

The square root of 22394881 is about 4732.3230025010. The cubic root of 22394881 is about 281.8704743596.

The spelling of 22394881 in words is "twenty-two million, three hundred ninety-four thousand, eight hundred eighty-one".