25217540 has 12 divisors (see below), whose sum is σ = 52956876. Its totient is φ = 10087008.

The previous prime is 25217537. The next prime is 25217557. The reversal of 25217540 is 4571252.

It can be written as a sum of positive squares in 2 ways, for example, as 17422276 + 7795264 = 4174^2 + 2792^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630419 + ... + 630458.

It is an arithmetic number, because the mean of its divisors is an integer number (4413073).

Almost surely, 2^25217540 is an apocalyptic number.

25217540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25217540 is an abundant number, since it is smaller than the sum of its proper divisors (27739336).

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

25217540 is a wasteful number, since it uses less digits than its factorization.

25217540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260886 (or 1260884 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 25217540 is about 5021.7068811312. The cubic root of 25217540 is about 293.2474467331.

Adding to 25217540 its reverse (4571252), we get a palindrome (29788792).

The spelling of 25217540 in words is "twenty-five million, two hundred seventeen thousand, five hundred forty".