56809439 has 4 divisors (see below), whose sum is σ = 57218280. Its totient is φ = 56400600.

The previous prime is 56809421. The next prime is 56809451. The reversal of 56809439 is 93490865.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56809439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56809439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56809469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204212 + ... + 204489.

It is an arithmetic number, because the mean of its divisors is an integer number (14304570).

Almost surely, 2^56809439 is an apocalyptic number.

56809439 is a deficient number, since it is larger than the sum of its proper divisors (408841).

56809439 is a wasteful number, since it uses less digits than its factorization.

56809439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408840.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 56809439 is about 7537.2036591829. The cubic root of 56809439 is about 384.4207604893.

The spelling of 56809439 in words is "fifty-six million, eight hundred nine thousand, four hundred thirty-nine".