840776139 has 32 divisors (see below), whose sum is σ = 1440714240. Its totient is φ = 474646176.

The previous prime is 840776117. The next prime is 840776159. The reversal of 840776139 is 931677048.

It is not a de Polignac number, because 840776139 - 2¹³ = 840767947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840776094 and 840776103.

It is not an unprimeable number, because it can be changed into a prime (840776159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11112 + ... + 42485.

It is an arithmetic number, because the mean of its divisors is an integer number (45022320).

Almost surely, 2^840776139 is an apocalyptic number.

840776139 is a deficient number, since it is larger than the sum of its proper divisors (599938101).

840776139 is a wasteful number, since it uses less digits than its factorization.

840776139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53696 (or 53690 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 840776139 is about 28996.1400707060. The cubic root of 840776139 is about 943.8293086926.

Subtracting 840776139 from its reverse (931677048), we obtain a palindrome (90900909).

The spelling of 840776139 in words is "eight hundred forty million, seven hundred seventy-six thousand, one hundred thirty-nine".