25438920 has 128 divisors (see below), whose sum is σ = 85881600. Its totient is φ = 5981184.

The previous prime is 25438909. The next prime is 25438927. The reversal of 25438920 is 2983452.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (25438927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35526 + ... + 36234.

It is an arithmetic number, because the mean of its divisors is an integer number (670950).

Almost surely, 2^25438920 is an apocalyptic number.

25438920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25438920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42940800).

25438920 is an abundant number, since it is smaller than the sum of its proper divisors (60442680).

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

25438920 is a wasteful number, since it uses less digits than its factorization.

25438920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759 (or 755 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 25438920 is about 5043.7010220670. The cubic root of 25438920 is about 294.1030690500.

The spelling of 25438920 in words is "twenty-five million, four hundred thirty-eight thousand, nine hundred twenty".