25387509 has 16 divisors (see below), whose sum is σ = 38761088. Its totient is φ = 14478912.

The previous prime is 25387493. The next prime is 25387547. The reversal of 25387509 is 90578352.

It is not a de Polignac number, because 25387509 - 2⁴ = 25387493 is a prime.

It is a super-2 number, since 2×25387509² = 1289051226450162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25387559) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15099 + ... + 16695.

It is an arithmetic number, because the mean of its divisors is an integer number (2422568).

Almost surely, 2^25387509 is an apocalyptic number.

It is an amenable number.

25387509 is a deficient number, since it is larger than the sum of its proper divisors (13373579).

25387509 is a wasteful number, since it uses less digits than its factorization.

25387509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 25387509 is about 5038.6018894134. The cubic root of 25387509 is about 293.9048120740.

The spelling of 25387509 in words is "twenty-five million, three hundred eighty-seven thousand, five hundred nine".