25261240 has 16 divisors (see below), whose sum is σ = 56837880. Its totient is φ = 10104480.

The previous prime is 25261213. The next prime is 25261267. The reversal of 25261240 is 4216252.

It is an interprime number because it is at equal distance from previous prime (25261213) and next prime (25261267).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315726 + ... + 315805.

Almost surely, 2^25261240 is an apocalyptic number.

25261240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25261240 is an abundant number, since it is smaller than the sum of its proper divisors (31576640).

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

25261240 is a wasteful number, since it uses less digits than its factorization.

25261240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631542 (or 631538 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 25261240 is about 5026.0561079240. The cubic root of 25261240 is about 293.4167405148.

Adding to 25261240 its reverse (4216252), we get a palindrome (29477492).

The spelling of 25261240 in words is "twenty-five million, two hundred sixty-one thousand, two hundred forty".