25406540 has 12 divisors (see below), whose sum is σ = 53353776. Its totient is φ = 10162608.

The previous prime is 25406539. The next prime is 25406543. The reversal of 25406540 is 4560452.

It is not an unprimeable number, because it can be changed into a prime (25406543) by changing a digit.

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, 635144 + ... + 635183.

It is an arithmetic number, because the mean of its divisors is an integer number (4446148).

Almost surely, 2^25406540 is an apocalyptic number.

25406540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25406540 is an abundant number, since it is smaller than the sum of its proper divisors (27947236).

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

25406540 is a wasteful number, since it uses less digits than its factorization.

25406540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270336 (or 1270334 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 25406540 is about 5040.4900555402. The cubic root of 25406540 is about 293.9782327661.

Adding to 25406540 its reverse (4560452), we get a palindrome (29966992).

The spelling of 25406540 in words is "twenty-five million, four hundred six thousand, five hundred forty".