25389865 has 8 divisors (see below), whose sum is σ = 31211208. Its totient is φ = 19816320.

The previous prime is 25389863. The next prime is 25389869. The reversal of 25389865 is 56898352.

It can be written as a sum of positive squares in 4 ways, for example, as 946729 + 24443136 = 973^2 + 4944^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25389865 - 2¹ = 25389863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25389863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61722 + ... + 62131.

It is an arithmetic number, because the mean of its divisors is an integer number (3901401).

Almost surely, 2^25389865 is an apocalyptic number.

It is an amenable number.

25389865 is a deficient number, since it is larger than the sum of its proper divisors (5821343).

25389865 is a wasteful number, since it uses less digits than its factorization.

25389865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123899.

The product of its digits is 518400, while the sum is 46.

The square root of 25389865 is about 5038.8356790036. The cubic root of 25389865 is about 293.9139033994.

It can be divided in two parts, 2538 and 9865, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 25389865 in words is "twenty-five million, three hundred eighty-nine thousand, eight hundred sixty-five".