805139 has 8 divisors (see below), whose sum is σ = 834768. Its totient is φ = 776160.

The previous prime is 805121. The next prime is 805153. The reversal of 805139 is 931508.

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

It is a cyclic number.

It is not a de Polignac number, because 805139 - 2¹⁶ = 739603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3989 + ... + 4185.

It is an arithmetic number, because the mean of its divisors is an integer number (104346).

2⁸⁰⁵¹³⁹ is an apocalyptic number.

805139 is a deficient number, since it is larger than the sum of its proper divisors (29629).

805139 is a wasteful number, since it uses less digits than its factorization.

805139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 805139 is about 897.2953805743. The cubic root of 805139 is about 93.0301285973.

The spelling of 805139 in words is "eight hundred five thousand, one hundred thirty-nine".