22215405 has 8 divisors (see below), whose sum is σ = 35544672. Its totient is φ = 11848208.

The previous prime is 22215371. The next prime is 22215409. The reversal of 22215405 is 50451222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22215405 - 2⁶ = 22215341 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22215409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 740499 + ... + 740528.

It is an arithmetic number, because the mean of its divisors is an integer number (4443084).

Almost surely, 2^22215405 is an apocalyptic number.

It is an amenable number.

22215405 is a deficient number, since it is larger than the sum of its proper divisors (13329267).

22215405 is a wasteful number, since it uses less digits than its factorization.

22215405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481035.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 22215405 is about 4713.3220768371. The cubic root of 22215405 is about 281.1154694873.

Adding to 22215405 its reverse (50451222), we get a palindrome (72666627).

It can be divided in two parts, 2221 and 5405, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 22215405 in words is "twenty-two million, two hundred fifteen thousand, four hundred five".