840077983 has 4 divisors (see below), whose sum is σ = 841586760. Its totient is φ = 838569208.

The previous prime is 840077947. The next prime is 840077993. The reversal of 840077983 is 389770048.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 840077983 - 2⁹ = 840077471 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 (840077993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753553 + ... + 754666.

It is an arithmetic number, because the mean of its divisors is an integer number (210396690).

Almost surely, 2^840077983 is an apocalyptic number.

840077983 is a deficient number, since it is larger than the sum of its proper divisors (1508777).

840077983 is a wasteful number, since it uses less digits than its factorization.

840077983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508776.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 840077983 is about 28984.0987957190. The cubic root of 840077983 is about 943.5679935669.

The spelling of 840077983 in words is "eight hundred forty million, seventy-seven thousand, nine hundred eighty-three".