22381405 has 4 divisors (see below), whose sum is σ = 26857692. Its totient is φ = 17905120.

The previous prime is 22381397. The next prime is 22381427. The reversal of 22381405 is 50418322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14462809 + 7918596 = 3803^2 + 2814^2 .

It is not a de Polignac number, because 22381405 - 2³ = 22381397 is a prime.

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 22381405.

It is a congruent number.

It is an unprimeable number.

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, 2238136 + ... + 2238145.

It is an arithmetic number, because the mean of its divisors is an integer number (6714423).

Almost surely, 2^22381405 is an apocalyptic number.

It is an amenable number.

22381405 is a deficient number, since it is larger than the sum of its proper divisors (4476287).

22381405 is an equidigital number, since it uses as much as digits as its factorization.

22381405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4476286.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 22381405 is about 4730.8989631993. The cubic root of 22381405 is about 281.8139249980.

Adding to 22381405 its reverse (50418322), we get a palindrome (72799727).

The spelling of 22381405 in words is "twenty-two million, three hundred eighty-one thousand, four hundred five".