84143857 has 4 divisors (see below), whose sum is σ = 96164416. Its totient is φ = 72123300.

The previous prime is 84143833. The next prime is 84143861. The reversal of 84143857 is 75834148.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84143857 - 2¹⁵ = 84111089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84143887) 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, 6010269 + ... + 6010282.

It is an arithmetic number, because the mean of its divisors is an integer number (24041104).

Almost surely, 2^84143857 is an apocalyptic number.

It is an amenable number.

84143857 is a deficient number, since it is larger than the sum of its proper divisors (12020559).

84143857 is a wasteful number, since it uses less digits than its factorization.

84143857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12020558.

The product of its digits is 107520, while the sum is 40.

The square root of 84143857 is about 9172.9960754379. The cubic root of 84143857 is about 438.2017811198.

The spelling of 84143857 in words is "eighty-four million, one hundred forty-three thousand, eight hundred fifty-seven".