25681939 has 8 divisors (see below), whose sum is σ = 27104000. Its totient is φ = 24266952.

The previous prime is 25681927. The next prime is 25681969. The reversal of 25681939 is 93918652.

It is a happy number.

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

It is not a de Polignac number, because 25681939 - 2¹⁵ = 25649171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25681895 and 25681904.

It is not an unprimeable number, because it can be changed into a prime (25681969) 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 7 ways as a sum of consecutive naturals, for example, 6802 + ... + 9880.

It is an arithmetic number, because the mean of its divisors is an integer number (3388000).

Almost surely, 2^25681939 is an apocalyptic number.

25681939 is a deficient number, since it is larger than the sum of its proper divisors (1422061).

25681939 is a wasteful number, since it uses less digits than its factorization.

25681939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537.

The product of its digits is 116640, while the sum is 43.

The square root of 25681939 is about 5067.7350956813. The cubic root of 25681939 is about 295.0366286032.

The spelling of 25681939 in words is "twenty-five million, six hundred eighty-one thousand, nine hundred thirty-nine".