25312140 has 72 divisors (see below), whose sum is σ = 87753120. Its totient is φ = 5785344.

The previous prime is 25312117. The next prime is 25312141. The reversal of 25312140 is 4121352.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (25312141) 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 23 ways as a sum of consecutive naturals, for example, 8785 + ... + 11304.

Almost surely, 2^25312140 is an apocalyptic number.

25312140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25312140 is an abundant number, since it is smaller than the sum of its proper divisors (62440980).

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

25312140 is a wasteful number, since it uses less digits than its factorization.

25312140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20111 (or 20106 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 25312140 is about 5031.1171721597. The cubic root of 25312140 is about 293.6136811281.

Adding to 25312140 its reverse (4121352), we get a palindrome (29433492).

It can be divided in two parts, 25312 and 140, that added together give a palindrome (25452).

The spelling of 25312140 in words is "twenty-five million, three hundred twelve thousand, one hundred forty".