840770391 has 8 divisors (see below), whose sum is σ = 1121351920. Its totient is φ = 560351232.

The previous prime is 840770383. The next prime is 840770393. The reversal of 840770391 is 193077048.

840770391 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 not a de Polignac number, because 840770391 - 2³ = 840770383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840770393) 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, 27946 + ... + 49623.

It is an arithmetic number, because the mean of its divisors is an integer number (140168990).

Almost surely, 2^840770391 is an apocalyptic number.

840770391 is a deficient number, since it is larger than the sum of its proper divisors (280581529).

840770391 is a wasteful number, since it uses less digits than its factorization.

840770391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81185.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 840770391 is about 28996.0409538958. The cubic root of 840770391 is about 943.8271578453.

The spelling of 840770391 in words is "eight hundred forty million, seven hundred seventy thousand, three hundred ninety-one".