83840805 has 16 divisors (see below), whose sum is σ = 149050560. Its totient is φ = 44715024.

The previous prime is 83840803. The next prime is 83840831. The reversal of 83840805 is 50804838.

It is not a de Polignac number, because 83840805 - 2¹ = 83840803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83840805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83840803) 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 15 ways as a sum of consecutive naturals, for example, 310387 + ... + 310656.

It is an arithmetic number, because the mean of its divisors is an integer number (9315660).

Almost surely, 2^83840805 is an apocalyptic number.

It is an amenable number.

83840805 is a deficient number, since it is larger than the sum of its proper divisors (65209755).

83840805 is a wasteful number, since it uses less digits than its factorization.

83840805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621057 (or 621051 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 83840805 is about 9156.4624719375. The cubic root of 83840805 is about 437.6750733333.

The spelling of 83840805 in words is "eighty-three million, eight hundred forty thousand, eight hundred five".