84042859 has 4 divisors (see below), whose sum is σ = 84233016. Its totient is φ = 83852704.

The previous prime is 84042823. The next prime is 84042869. The reversal of 84042859 is 95824048.

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 84042859 - 2⁹ = 84042347 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84042869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94414 + ... + 95299.

It is an arithmetic number, because the mean of its divisors is an integer number (21058254).

Almost surely, 2^84042859 is an apocalyptic number.

84042859 is a deficient number, since it is larger than the sum of its proper divisors (190157).

84042859 is a wasteful number, since it uses less digits than its factorization.

84042859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190156.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 84042859 is about 9167.4892418808. The cubic root of 84042859 is about 438.0263861699.

The spelling of 84042859 in words is "eighty-four million, forty-two thousand, eight hundred fifty-nine".