25865397 has 6 divisors (see below), whose sum is σ = 37361142. Its totient is φ = 17243592.

The previous prime is 25865387. The next prime is 25865401. The reversal of 25865397 is 79356852.

It is a happy number.

25865397 is a `hidden beast` number, since 258 + 6 + 5 + 397 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23677956 + 2187441 = 4866^2 + 1479^2 .

It is not a de Polignac number, because 25865397 - 2¹¹ = 25863349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25865387) 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 5 ways as a sum of consecutive naturals, for example, 1436958 + ... + 1436975.

It is an arithmetic number, because the mean of its divisors is an integer number (6226857).

Almost surely, 2^25865397 is an apocalyptic number.

It is an amenable number.

25865397 is a deficient number, since it is larger than the sum of its proper divisors (11495745).

25865397 is a wasteful number, since it uses less digits than its factorization.

25865397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873939 (or 2873936 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 25865397 is about 5085.8034763447. The cubic root of 25865397 is about 295.7374902026.

It can be divided in two parts, 25865 and 397, that added together give a palindrome (26262).

The spelling of 25865397 in words is "twenty-five million, eight hundred sixty-five thousand, three hundred ninety-seven".