25989905 has 16 divisors (see below), whose sum is σ = 31881600. Its totient is φ = 20334720.

The previous prime is 25989883. The next prime is 25989917. The reversal of 25989905 is 50998952.

It is not a de Polignac number, because 25989905 - 2⁶ = 25989841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25989905.

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, 63341 + ... + 63749.

It is an arithmetic number, because the mean of its divisors is an integer number (1992600).

Almost surely, 2^25989905 is an apocalyptic number.

It is an amenable number.

25989905 is a deficient number, since it is larger than the sum of its proper divisors (5891695).

25989905 is a wasteful number, since it uses less digits than its factorization.

25989905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664.

The product of its (nonzero) digits is 291600, while the sum is 47.

The square root of 25989905 is about 5098.0295212955. The cubic root of 25989905 is about 296.2112603417.

The spelling of 25989905 in words is "twenty-five million, nine hundred eighty-nine thousand, nine hundred five".