840709983 has 8 divisors (see below), whose sum is σ = 1124599168. Its totient is φ = 558647064.

The previous prime is 840709981. The next prime is 840709997. The reversal of 840709983 is 389907048.

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

It is not a de Polignac number, because 840709983 - 2¹ = 840709981 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 (840709981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455491 + ... + 457332.

It is an arithmetic number, because the mean of its divisors is an integer number (140574896).

Almost surely, 2^840709983 is an apocalyptic number.

840709983 is a deficient number, since it is larger than the sum of its proper divisors (283889185).

840709983 is a wasteful number, since it uses less digits than its factorization.

840709983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913133.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 840709983 is about 28994.9992757372. Note that the first 3 decimals coincide. The cubic root of 840709983 is about 943.8045531496.

The spelling of 840709983 in words is "eight hundred forty million, seven hundred nine thousand, nine hundred eighty-three".