25390540 has 24 divisors (see below), whose sum is σ = 60937632. Its totient is φ = 8705280.

The previous prime is 25390531. The next prime is 25390549. The reversal of 25390540 is 4509352.

It is an interprime number because it is at equal distance from previous prime (25390531) and next prime (25390549).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 25390499 and 25390508.

It is not an unprimeable number, because it can be changed into a prime (25390549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90541 + ... + 90820.

It is an arithmetic number, because the mean of its divisors is an integer number (2539068).

Almost surely, 2^25390540 is an apocalyptic number.

25390540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25390540 is an abundant number, since it is smaller than the sum of its proper divisors (35547092).

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

25390540 is a wasteful number, since it uses less digits than its factorization.

25390540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181377 (or 181375 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 25390540 is about 5038.9026583176. The cubic root of 25390540 is about 293.9165079837.

Adding to 25390540 its reverse (4509352), we get a palindrome (29899892).

The spelling of 25390540 in words is "twenty-five million, three hundred ninety thousand, five hundred forty".