25421445 has 96 divisors (see below), whose sum is σ = 54163200. Its totient is φ = 11430720.

The previous prime is 25421423. The next prime is 25421453. The reversal of 25421445 is 54412452.

It is not a de Polignac number, because 25421445 - 2⁵ = 25421413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 416715 + ... + 416775.

It is an arithmetic number, because the mean of its divisors is an integer number (564200).

Almost surely, 2^25421445 is an apocalyptic number.

It is an amenable number.

25421445 is an abundant number, since it is smaller than the sum of its proper divisors (28741755).

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

25421445 is an frugal number, since it uses more digits than its factorization.

25421445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 76 counting only the distinct ones).

The product of its digits is 6400, while the sum is 27.

The square root of 25421445 is about 5041.9683656286. The cubic root of 25421445 is about 294.0357099481.

Adding to 25421445 its reverse (54412452), we get a palindrome (79833897).

The spelling of 25421445 in words is "twenty-five million, four hundred twenty-one thousand, four hundred forty-five".