25681938 has 32 divisors (see below), whose sum is σ = 54000000. Its totient is φ = 8126976.

The previous prime is 25681927. The next prime is 25681969. The reversal of 25681938 is 83918652.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25681938.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19938 + ... + 21186.

It is an arithmetic number, because the mean of its divisors is an integer number (1687500).

Almost surely, 2^25681938 is an apocalyptic number.

25681938 is an abundant number, since it is smaller than the sum of its proper divisors (28318062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25681938 is a wasteful number, since it uses less digits than its factorization.

25681938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426.

The product of its digits is 103680, while the sum is 42.

The square root of 25681938 is about 5067.7349970179. The cubic root of 25681938 is about 295.0366247739.

The spelling of 25681938 in words is "twenty-five million, six hundred eighty-one thousand, nine hundred thirty-eight".