84443904 has 144 divisors (see below), whose sum is σ = 263267200. Its totient is φ = 26625024.

The previous prime is 84443903. The next prime is 84443917. The reversal of 84443904 is 40934448.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×84443904² = 14261545845522432, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (84443903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131007 + ... + 131649.

Almost surely, 2^84443904 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 84443904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131633600).

84443904 is an abundant number, since it is smaller than the sum of its proper divisors (178823296).

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

84443904 is a wasteful number, since it uses less digits than its factorization.

84443904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 84443904 is about 9189.3364287091. The cubic root of 84443904 is about 438.7220217385.

The spelling of 84443904 in words is "eighty-four million, four hundred forty-three thousand, nine hundred four".