84040000 has 140 divisors (see below), whose sum is σ = 228526848. Its totient is φ = 30400000.

The previous prime is 84039997. The next prime is 84040007. The reversal of 84040000 is 4048.

84040000 is nontrivially palindromic in base 7.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84040007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 439905 + ... + 440095.

Almost surely, 2^84040000 is an apocalyptic number.

84040000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114263424).

84040000 is an abundant number, since it is smaller than the sum of its proper divisors (144486848).

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

84040000 is a wasteful number, since it uses less digits than its factorization.

84040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 84040000 is about 9167.3333090927. Note that the first 4 decimals coincide. The cubic root of 84040000 is about 438.0214191342.

Adding to 84040000 its reverse (4048), we get a palindrome (84044048).

The spelling of 84040000 in words is "eighty-four million, forty thousand".