125805905 has 8 divisors (see below), whose sum is σ = 155837184. Its totient is φ = 97398000.

The previous prime is 125805893. The next prime is 125805913. The reversal of 125805905 is 509508521.

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

It is not a de Polignac number, because 125805905 - 2⁸ = 125805649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405671 + ... + 405980.

It is an arithmetic number, because the mean of its divisors is an integer number (19479648).

Almost surely, 2^125805905 is an apocalyptic number.

It is an amenable number.

125805905 is a deficient number, since it is larger than the sum of its proper divisors (30031279).

125805905 is an equidigital number, since it uses as much as digits as its factorization.

125805905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811687.

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 125805905 is about 11216.3231497670. The cubic root of 125805905 is about 501.0722389635.

The spelling of 125805905 in words is "one hundred twenty-five million, eight hundred five thousand, nine hundred five".