805640403 has 8 divisors (see below), whose sum is σ = 1077620368. Its totient is φ = 535377024.

The previous prime is 805640399. The next prime is 805640441. The reversal of 805640403 is 304046508.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 805640403 - 2² = 805640399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805640443) 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 7 ways as a sum of consecutive naturals, for example, 428050 + ... + 429927.

It is an arithmetic number, because the mean of its divisors is an integer number (134702546).

Almost surely, 2^805640403 is an apocalyptic number.

805640403 is a deficient number, since it is larger than the sum of its proper divisors (271979965).

805640403 is a wasteful number, since it uses less digits than its factorization.

805640403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858293.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 805640403 is about 28383.8052945689. The cubic root of 805640403 is about 930.4943619766.

The spelling of 805640403 in words is "eight hundred five million, six hundred forty thousand, four hundred three".