906890305 has 4 divisors (see below), whose sum is σ = 1088268372. Its totient is φ = 725512240.

The previous prime is 906890297. The next prime is 906890317. The reversal of 906890305 is 503098609.

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 631064641 + 275825664 = 25121^2 + 16608^2 .

It is not a de Polignac number, because 906890305 - 2³ = 906890297 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 90689026 + ... + 90689035.

It is an arithmetic number, because the mean of its divisors is an integer number (272067093).

Almost surely, 2^906890305 is an apocalyptic number.

It is an amenable number.

906890305 is a deficient number, since it is larger than the sum of its proper divisors (181378067).

906890305 is a wasteful number, since it uses less digits than its factorization.

906890305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181378066.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 906890305 is about 30114.6194563371. The cubic root of 906890305 is about 967.9470183789.

The spelling of 906890305 in words is "nine hundred six million, eight hundred ninety thousand, three hundred five".