2840400 has 120 divisors (see below), whose sum is σ = 10148160. Its totient is φ = 754560.

The previous prime is 2840393. The next prime is 2840417. The reversal of 2840400 is 40482.

It is a happy number.

2840400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10669 + ... + 10931.

It is an arithmetic number, because the mean of its divisors is an integer number (84568).

2^2840400 is an apocalyptic number.

2840400 is a gapful number since it is divisible by the number (20) 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 2840400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5074080).

2840400 is an abundant number, since it is smaller than the sum of its proper divisors (7307760).

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

2840400 is a wasteful number, since it uses less digits than its factorization.

2840400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 2840400 is about 1685.3486286226. The cubic root of 2840400 is about 141.6206232530.

Adding to 2840400 its reverse (40482), we get a palindrome (2880882).

It can be divided in two parts, 2840 and 400, that added together give a triangular number (3240 = T₈₀).

The spelling of 2840400 in words is "two million, eight hundred forty thousand, four hundred".