84143844 has 72 divisors (see below), whose sum is σ = 223746432. Its totient is φ = 26611200.

The previous prime is 84143833. The next prime is 84143861. The reversal of 84143844 is 44834148.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 84143799 and 84143808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124692 + ... + 125364.

Almost surely, 2^84143844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84143844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111873216).

84143844 is an abundant number, since it is smaller than the sum of its proper divisors (139602588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84143844 is a wasteful number, since it uses less digits than its factorization.

84143844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857 (or 852 counting only the distinct ones).

The product of its digits is 49152, while the sum is 36.

The square root of 84143844 is about 9172.9953668363. The cubic root of 84143844 is about 438.2017585528.

The spelling of 84143844 in words is "eighty-four million, one hundred forty-three thousand, eight hundred forty-four".