816798139 has 8 divisors (see below), whose sum is σ = 829465088. Its totient is φ = 804145320.

The previous prime is 816798131. The next prime is 816798161. The reversal of 816798139 is 931897618.

It is a happy number.

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 816798139 - 2³ = 816798131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816798131) 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, 217294 + ... + 221020.

It is an arithmetic number, because the mean of its divisors is an integer number (103683136).

Almost surely, 2^816798139 is an apocalyptic number.

816798139 is a deficient number, since it is larger than the sum of its proper divisors (12666949).

816798139 is a wasteful number, since it uses less digits than its factorization.

816798139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7065.

The product of its digits is 653184, while the sum is 52.

The square root of 816798139 is about 28579.6805265559. The cubic root of 816798139 is about 934.7703169612.

The spelling of 816798139 in words is "eight hundred sixteen million, seven hundred ninety-eight thousand, one hundred thirty-nine".