25436540 has 12 divisors (see below), whose sum is σ = 53416776. Its totient is φ = 10174608.

The previous prime is 25436533. The next prime is 25436549. The reversal of 25436540 is 4563452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25436549) 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, 635894 + ... + 635933.

It is an arithmetic number, because the mean of its divisors is an integer number (4451398).

Almost surely, 2^25436540 is an apocalyptic number.

25436540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25436540 is an abundant number, since it is smaller than the sum of its proper divisors (27980236).

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

25436540 is a wasteful number, since it uses less digits than its factorization.

25436540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271836 (or 1271834 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 25436540 is about 5043.4650786934. The cubic root of 25436540 is about 294.0938969214.

Adding to 25436540 its reverse (4563452), we get a palindrome (29999992).

The spelling of 25436540 in words is "twenty-five million, four hundred thirty-six thousand, five hundred forty".