765820139 has 16 divisors (see below), whose sum is σ = 909446400. Its totient is φ = 630952224.

The previous prime is 765820103. The next prime is 765820147. The reversal of 765820139 is 931028567.

It is not a de Polignac number, because 765820139 - 2²⁴ = 749042923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 765820096 and 765820105.

It is not an unprimeable number, because it can be changed into a prime (765828139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37772 + ... + 54390.

It is an arithmetic number, because the mean of its divisors is an integer number (56840400).

Almost surely, 2^765820139 is an apocalyptic number.

765820139 is a deficient number, since it is larger than the sum of its proper divisors (143626261).

765820139 is a wasteful number, since it uses less digits than its factorization.

765820139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16882.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 765820139 is about 27673.4554943903. The cubic root of 765820139 is about 914.9041431628.

The spelling of 765820139 in words is "seven hundred sixty-five million, eight hundred twenty thousand, one hundred thirty-nine".