250905 has 16 divisors (see below), whose sum is σ = 411840. Its totient is φ = 130368.

The previous prime is 250889. The next prime is 250919. The reversal of 250905 is 509052.

250905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 250905 - 2⁴ = 250889 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 250905.

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, 451 + ... + 839.

It is an arithmetic number, because the mean of its divisors is an integer number (25740).

2²⁵⁰⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

250905 is a deficient number, since it is larger than the sum of its proper divisors (160935).

250905 is a wasteful number, since it uses less digits than its factorization.

250905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 250905 is about 500.9041824541. The cubic root of 250905 is about 63.0719761904.

Adding to 250905 its reverse (509052), we get a palindrome (759957).

The spelling of 250905 in words is "two hundred fifty thousand, nine hundred five".