25140240 has 160 divisors (see below), whose sum is σ = 88208640. Its totient is φ = 6580224.

The previous prime is 25140239. The next prime is 25140259. The reversal of 25140240 is 4204152.

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

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 222424 + ... + 222536.

It is an arithmetic number, because the mean of its divisors is an integer number (551304).

Almost surely, 2^25140240 is an apocalyptic number.

25140240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25140240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44104320).

25140240 is an abundant number, since it is smaller than the sum of its proper divisors (63068400).

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

25140240 is a wasteful number, since it uses less digits than its factorization.

25140240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 25140240 is about 5014.0043877125. The cubic root of 25140240 is about 292.9475069717.

Adding to 25140240 its reverse (4204152), we get a palindrome (29344392).

The spelling of 25140240 in words is "twenty-five million, one hundred forty thousand, two hundred forty".