25172442 has 48 divisors (see below), whose sum is σ = 58339008. Its totient is φ = 7824960.

The previous prime is 25172437. The next prime is 25172449. The reversal of 25172442 is 24427152.

It is not an unprimeable number, because it can be changed into a prime (25172449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16233 + ... + 17715.

It is an arithmetic number, because the mean of its divisors is an integer number (1215396).

Almost surely, 2^25172442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25172442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29169504).

25172442 is an abundant number, since it is smaller than the sum of its proper divisors (33166566).

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

25172442 is a wasteful number, since it uses less digits than its factorization.

25172442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555 (or 1552 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 25172442 is about 5017.2145658722. The cubic root of 25172442 is about 293.0725319080.

Adding to 25172442 its reverse (24427152), we get a palindrome (49599594).

The spelling of 25172442 in words is "twenty-five million, one hundred seventy-two thousand, four hundred forty-two".