84400000 has 96 divisors (see below), whose sum is σ = 211158360. Its totient is φ = 33600000.

The previous prime is 84399989. The next prime is 84400003. The reversal of 84400000 is 448.

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

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84400003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 399895 + ... + 400105.

Almost surely, 2^84400000 is an apocalyptic number.

84400000 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 84400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105579180).

84400000 is an abundant number, since it is smaller than the sum of its proper divisors (126758360).

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

84400000 is an frugal number, since it uses more digits than its factorization.

84400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 218 counting only the distinct ones).

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

The square root of 84400000 is about 9186.9472622847. The cubic root of 84400000 is about 438.6459752355.

Adding to 84400000 its reverse (448), we get a palindrome (84400448).

The spelling of 84400000 in words is "eighty-four million, four hundred thousand".