25211540 has 12 divisors (see below), whose sum is σ = 52944276. Its totient is φ = 10084608.

The previous prime is 25211539. The next prime is 25211567. The reversal of 25211540 is 4511252.

It can be written as a sum of positive squares in 2 ways, for example, as 4545424 + 20666116 = 2132^2 + 4546^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1260577 = 25211540 / (2 + 5 + 2 + 1 + 1 + 5 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630269 + ... + 630308.

It is an arithmetic number, because the mean of its divisors is an integer number (4412023).

Almost surely, 2^25211540 is an apocalyptic number.

25211540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25211540 is an abundant number, since it is smaller than the sum of its proper divisors (27732736).

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

25211540 is a wasteful number, since it uses less digits than its factorization.

25211540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260586 (or 1260584 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 25211540 is about 5021.1094391578. The cubic root of 25211540 is about 293.2241874694.

Adding to 25211540 its reverse (4511252), we get a palindrome (29722792).

The spelling of 25211540 in words is "twenty-five million, two hundred eleven thousand, five hundred forty".