25257940 has 12 divisors (see below), whose sum is σ = 53041716. Its totient is φ = 10103168.

The previous prime is 25257931. The next prime is 25257949. The reversal of 25257940 is 4975252.

It is an interprime number because it is at equal distance from previous prime (25257931) and next prime (25257949).

It can be written as a sum of positive squares in 2 ways, for example, as 3392964 + 21864976 = 1842^2 + 4676^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25257896 and 25257905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25257949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631429 + ... + 631468.

It is an arithmetic number, because the mean of its divisors is an integer number (4420143).

Almost surely, 2^25257940 is an apocalyptic number.

25257940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25257940 is an abundant number, since it is smaller than the sum of its proper divisors (27783776).

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

25257940 is a wasteful number, since it uses less digits than its factorization.

25257940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262906 (or 1262904 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 25257940 is about 5025.7278079896. The cubic root of 25257940 is about 293.4039631345.

The spelling of 25257940 in words is "twenty-five million, two hundred fifty-seven thousand, nine hundred forty".