25980905 has 4 divisors (see below), whose sum is σ = 31177092. Its totient is φ = 20784720.

The previous prime is 25980881. The next prime is 25980953. The reversal of 25980905 is 50908952.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8248384 + 17732521 = 2872^2 + 4211^2 .

It is not a de Polignac number, because 25980905 - 2⁶ = 25980841 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2598086 + ... + 2598095.

It is an arithmetic number, because the mean of its divisors is an integer number (7794273).

Almost surely, 2^25980905 is an apocalyptic number.

It is an amenable number.

25980905 is a deficient number, since it is larger than the sum of its proper divisors (5196187).

25980905 is an equidigital number, since it uses as much as digits as its factorization.

25980905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196186.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 25980905 is about 5097.1467508794. The cubic root of 25980905 is about 296.1770648964.

The spelling of 25980905 in words is "twenty-five million, nine hundred eighty thousand, nine hundred five".