840085791 has 8 divisors (see below), whose sum is σ = 1123938480. Its totient is φ = 558145152.

The previous prime is 840085789. The next prime is 840085793. The reversal of 840085791 is 197580048.

It is an interprime number because it is at equal distance from previous prime (840085789) and next prime (840085793).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 840085791 - 2¹ = 840085789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840085793) 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, 476986 + ... + 478743.

It is an arithmetic number, because the mean of its divisors is an integer number (140492310).

Almost surely, 2^840085791 is an apocalyptic number.

840085791 is a deficient number, since it is larger than the sum of its proper divisors (283852689).

840085791 is a wasteful number, since it uses less digits than its factorization.

840085791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956025.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 840085791 is about 28984.2334899510. The cubic root of 840085791 is about 943.5709168495.

The spelling of 840085791 in words is "eight hundred forty million, eighty-five thousand, seven hundred ninety-one".