905806 has 24 divisors (see below), whose sum is σ = 1580040. Its totient is φ = 388080.

The previous prime is 905803. The next prime is 905819. The reversal of 905806 is 608509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (905803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4500 + ... + 4696.

It is an arithmetic number, because the mean of its divisors is an integer number (65835).

2⁹⁰⁵⁸⁰⁶ is an apocalyptic number.

905806 is a deficient number, since it is larger than the sum of its proper divisors (674234).

905806 is a wasteful number, since it uses less digits than its factorization.

905806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 905806 is about 951.7384094382. The cubic root of 905806 is about 96.7561095791.

It can be divided in two parts, 905 and 806, that added together give a triangular number (1711 = T₅₈).

The spelling of 905806 in words is "nine hundred five thousand, eight hundred six".