22400005 has 4 divisors (see below), whose sum is σ = 26880012. Its totient is φ = 17920000.

The previous prime is 22399991. The next prime is 22400009. The reversal of 22400005 is 50000422.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50000422 = 2 ⋅25000211.

It can be written as a sum of positive squares in 2 ways, for example, as 9740641 + 12659364 = 3121^2 + 3558^2 .

It is not a de Polignac number, because 22400005 - 2¹¹ = 22397957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22400009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2239996 + ... + 2240005.

It is an arithmetic number, because the mean of its divisors is an integer number (6720003).

Almost surely, 2^22400005 is an apocalyptic number.

It is an amenable number.

22400005 is a deficient number, since it is larger than the sum of its proper divisors (4480007).

22400005 is an equidigital number, since it uses as much as digits as its factorization.

22400005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4480006.

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 22400005 is about 4732.8643547011. The cubic root of 22400005 is about 281.8919702567.

Adding to 22400005 its reverse (50000422), we get a palindrome (72400427).

The spelling of 22400005 in words is "twenty-two million, four hundred thousand, five".