25401222 has 128 divisors (see below), whose sum is σ = 72576000. Its totient is φ = 6393600.

The previous prime is 25401221. The next prime is 25401227. The reversal of 25401222 is 22210452.

25401222 is a `hidden beast` number, since 2 + 540 + 122 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 25401195 and 25401204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25401221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 170404 + ... + 170552.

It is an arithmetic number, because the mean of its divisors is an integer number (567000).

Almost surely, 2^25401222 is an apocalyptic number.

25401222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 25401222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36288000).

25401222 is an abundant number, since it is smaller than the sum of its proper divisors (47174778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25401222 is a wasteful number, since it uses less digits than its factorization.

25401222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 25401222 is about 5039.9624998605. The cubic root of 25401222 is about 293.9577198675.

Adding to 25401222 its reverse (22210452), we get a palindrome (47611674).

The spelling of 25401222 in words is "twenty-five million, four hundred one thousand, two hundred twenty-two".