25539012 has 18 divisors (see below), whose sum is σ = 64557038. Its totient is φ = 8512992.

The previous prime is 25538969. The next prime is 25539013. The reversal of 25539012 is 21093552.

It can be written as a sum of positive squares in only one way, i.e., 23270976 + 2268036 = 4824^2 + 1506^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×25539012² = 1304482267872288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25539013) 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 5 ways as a sum of consecutive naturals, for example, 354673 + ... + 354744.

Almost surely, 2^25539012 is an apocalyptic number.

It is an amenable number.

25539012 is an abundant number, since it is smaller than the sum of its proper divisors (39018026).

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

25539012 is a wasteful number, since it uses less digits than its factorization.

25539012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709427 (or 709422 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 25539012 is about 5053.6137565113. The cubic root of 25539012 is about 294.4882903365.

The spelling of 25539012 in words is "twenty-five million, five hundred thirty-nine thousand, twelve".