809538457 has 12 divisors (see below), whose sum is σ = 1014147876. Its totient is φ = 640513440.

The previous prime is 809538439. The next prime is 809538461. The reversal of 809538457 is 754835908.

It can be written as a sum of positive squares in 2 ways, for example, as 342287001 + 467251456 = 18501^2 + 21616^2 .

It is not a de Polignac number, because 809538457 - 2²⁷ = 675320729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 809538457.

It is not an unprimeable number, because it can be changed into a prime (809538427) 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, 634794 + ... + 636067.

It is an arithmetic number, because the mean of its divisors is an integer number (84512323).

Almost surely, 2^809538457 is an apocalyptic number.

It is an amenable number.

809538457 is a deficient number, since it is larger than the sum of its proper divisors (204609419).

809538457 is a wasteful number, since it uses less digits than its factorization.

809538457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270888 (or 1270881 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 49.

The square root of 809538457 is about 28452.3893021307. The cubic root of 809538457 is about 931.9926661208.

The spelling of 809538457 in words is "eight hundred nine million, five hundred thirty-eight thousand, four hundred fifty-seven".