25807940 has 24 divisors (see below), whose sum is σ = 54418392. Its totient is φ = 10280960.

The previous prime is 25807939. The next prime is 25807949. The reversal of 25807940 is 4970852.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15555136 + 10252804 = 3944^2 + 3202^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25807940.

It is not an unprimeable number, because it can be changed into a prime (25807949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2630 + ... + 7650.

It is an arithmetic number, because the mean of its divisors is an integer number (2267433).

Almost surely, 2^25807940 is an apocalyptic number.

25807940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25807940 is an abundant number, since it is smaller than the sum of its proper divisors (28610452).

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

25807940 is a wasteful number, since it uses less digits than its factorization.

25807940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5287 (or 5285 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 25807940 is about 5080.1515725419. The cubic root of 25807940 is about 295.5183455981.

The spelling of 25807940 in words is "twenty-five million, eight hundred seven thousand, nine hundred forty".