840032809 has 16 divisors (see below), whose sum is σ = 1048642560. Its totient is φ = 653740560.

The previous prime is 840032789. The next prime is 840032839. The reversal of 840032809 is 908230048.

It is not a de Polignac number, because 840032809 - 2⁵ = 840032777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840032839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58102 + ... + 71104.

It is an arithmetic number, because the mean of its divisors is an integer number (65540160).

Almost surely, 2^840032809 is an apocalyptic number.

It is an amenable number.

840032809 is a deficient number, since it is larger than the sum of its proper divisors (208609751).

840032809 is a wasteful number, since it uses less digits than its factorization.

840032809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13860.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 840032809 is about 28983.3194958756. The cubic root of 840032809 is about 943.5510802543.

It can be divided in two parts, 8400 and 32809, that added together give a square (41209 = 203²).

The spelling of 840032809 in words is "eight hundred forty million, thirty-two thousand, eight hundred nine".