840797091 has 20 divisors (see below), whose sum is σ = 1257368112. Its totient is φ = 559923408.

The previous prime is 840797077. The next prime is 840797117. The reversal of 840797091 is 190797048.

840797091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 840797091 - 2²³ = 832408483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840797011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 76930 + ... + 87176.

Almost surely, 2^840797091 is an apocalyptic number.

840797091 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

840797091 is a deficient number, since it is larger than the sum of its proper divisors (416571021).

840797091 is a wasteful number, since it uses less digits than its factorization.

840797091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11272 (or 11263 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 840797091 is about 28996.5013579225. The cubic root of 840797091 is about 943.8371486500.

The spelling of 840797091 in words is "eight hundred forty million, seven hundred ninety-seven thousand, ninety-one".