25407240 has 32 divisors (see below), whose sum is σ = 76222080. Its totient is φ = 6775232.

The previous prime is 25407223. The next prime is 25407241. The reversal of 25407240 is 4270452.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 25407240.

It is not an unprimeable number, because it can be changed into a prime (25407241) 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 7 ways as a sum of consecutive naturals, for example, 105744 + ... + 105983.

It is an arithmetic number, because the mean of its divisors is an integer number (2381940).

Almost surely, 2^25407240 is an apocalyptic number.

25407240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25407240 is an abundant number, since it is smaller than the sum of its proper divisors (50814840).

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

25407240 is a wasteful number, since it uses less digits than its factorization.

25407240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211741 (or 211737 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 25407240 is about 5040.5594927547. The cubic root of 25407240 is about 293.9809326336.

Adding to 25407240 its reverse (4270452), we get a palindrome (29677692).

The spelling of 25407240 in words is "twenty-five million, four hundred seven thousand, two hundred forty".