25197420 has 144 divisors (see below), whose sum is σ = 80075520. Its totient is φ = 5892480.

The previous prime is 25197391. The next prime is 25197437. The reversal of 25197420 is 2479152.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 812805 + ... + 812835.

It is an arithmetic number, because the mean of its divisors is an integer number (556080).

Almost surely, 2^25197420 is an apocalyptic number.

25197420 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 25197420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40037760).

25197420 is an abundant number, since it is smaller than the sum of its proper divisors (54878100).

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

25197420 is a wasteful number, since it uses less digits than its factorization.

25197420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 25197420 is about 5019.7031784758. The cubic root of 25197420 is about 293.1694361040.

The spelling of 25197420 in words is "twenty-five million, one hundred ninety-seven thousand, four hundred twenty".