25864139 has 4 divisors (see below), whose sum is σ = 29559024. Its totient is φ = 22169256.

The previous prime is 25864133. The next prime is 25864141. The reversal of 25864139 is 93146852.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25864139 is a prime.

It is a super-3 number, since 3×25864139³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25864133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1847432 + ... + 1847445.

It is an arithmetic number, because the mean of its divisors is an integer number (7389756).

Almost surely, 2^25864139 is an apocalyptic number.

25864139 is a deficient number, since it is larger than the sum of its proper divisors (3694885).

25864139 is an equidigital number, since it uses as much as digits as its factorization.

25864139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3694884.

The product of its digits is 51840, while the sum is 38.

The square root of 25864139 is about 5085.6797972346. The cubic root of 25864139 is about 295.7326955885.

The spelling of 25864139 in words is "twenty-five million, eight hundred sixty-four thousand, one hundred thirty-nine".