22145725 has 12 divisors (see below), whose sum is σ = 31383904. Its totient is φ = 15185520.

The previous prime is 22145723. The next prime is 22145743. The reversal of 22145725 is 52754122.

It is not a de Polignac number, because 22145725 - 2¹ = 22145723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22145693 and 22145702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22145723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63099 + ... + 63448.

Almost surely, 2^22145725 is an apocalyptic number.

22145725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22145725 is a deficient number, since it is larger than the sum of its proper divisors (9238179).

22145725 is a wasteful number, since it uses less digits than its factorization.

22145725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126564 (or 126559 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 22145725 is about 4705.9244575322. The cubic root of 22145725 is about 280.8212496060.

Adding to 22145725 its reverse (52754122), we get a palindrome (74899847).

The spelling of 22145725 in words is "twenty-two million, one hundred forty-five thousand, seven hundred twenty-five".