809427445 has 4 divisors (see below), whose sum is σ = 971312940. Its totient is φ = 647541952.

The previous prime is 809427419. The next prime is 809427449. The reversal of 809427445 is 544724908.

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 318051556 + 491375889 = 17834^2 + 22167^2 .

It is a cyclic number.

It is not a de Polignac number, because 809427445 - 2⁵ = 809427413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809427449) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 80942740 + ... + 80942749.

It is an arithmetic number, because the mean of its divisors is an integer number (242828235).

Almost surely, 2^809427445 is an apocalyptic number.

It is an amenable number.

809427445 is a deficient number, since it is larger than the sum of its proper divisors (161885495).

809427445 is a wasteful number, since it uses less digits than its factorization.

809427445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161885494.

The product of its (nonzero) digits is 322560, while the sum is 43.

The square root of 809427445 is about 28450.4383973253. The cubic root of 809427445 is about 931.9500627919.

The spelling of 809427445 in words is "eight hundred nine million, four hundred twenty-seven thousand, four hundred forty-five".