817042139 has 8 divisors (see below), whose sum is σ = 823690560. Its totient is φ = 810405000.

The previous prime is 817042129. The next prime is 817042229. The reversal of 817042139 is 931240718.

817042139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 817042139 - 2²⁴ = 800264923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 817042099 and 817042108.

It is not an unprimeable number, because it can be changed into a prime (817042129) 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, 199664 + ... + 203714.

It is an arithmetic number, because the mean of its divisors is an integer number (102961320).

Almost surely, 2^817042139 is an apocalyptic number.

817042139 is a deficient number, since it is larger than the sum of its proper divisors (6648421).

817042139 is a wasteful number, since it uses less digits than its factorization.

817042139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5641.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 817042139 is about 28583.9489749055. The cubic root of 817042139 is about 934.8633882023.

The spelling of 817042139 in words is "eight hundred seventeen million, forty-two thousand, one hundred thirty-nine".