809139406 has 8 divisors (see below), whose sum is σ = 1227346560. Its totient is φ = 400023888.

The previous prime is 809139403. The next prime is 809139407. The reversal of 809139406 is 604931908.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809139403) 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, 2272686 + ... + 2273041.

It is an arithmetic number, because the mean of its divisors is an integer number (153418320).

Almost surely, 2^809139406 is an apocalyptic number.

809139406 is a deficient number, since it is larger than the sum of its proper divisors (418207154).

809139406 is a wasteful number, since it uses less digits than its factorization.

809139406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4545818.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 809139406 is about 28445.3758280674. The cubic root of 809139406 is about 931.8395032378.

The spelling of 809139406 in words is "eight hundred nine million, one hundred thirty-nine thousand, four hundred six".