22405525 has 12 divisors (see below), whose sum is σ = 28165732. Its totient is φ = 17677440.

The previous prime is 22405501. The next prime is 22405547. The reversal of 22405525 is 52550422.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2683044 + 19722481 = 1638^2 + 4441^2 .

It is not a de Polignac number, because 22405525 - 2¹⁷ = 22274453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 22405525.

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 11 ways as a sum of consecutive naturals, for example, 4314 + ... + 7963.

Almost surely, 2^22405525 is an apocalyptic number.

22405525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22405525 is a deficient number, since it is larger than the sum of its proper divisors (5760207).

22405525 is a wasteful number, since it uses less digits than its factorization.

22405525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12360 (or 12355 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 22405525 is about 4733.4474751496. The cubic root of 22405525 is about 281.9151237616.

Adding to 22405525 its reverse (52550422), we get a palindrome (74955947).

The spelling of 22405525 in words is "twenty-two million, four hundred five thousand, five hundred twenty-five".