2809240 has 64 divisors (see below), whose sum is σ = 7372800. Its totient is φ = 943488.

The previous prime is 2809223. The next prime is 2809241. The reversal of 2809240 is 429082.

2809240 is a modest number, since divided by 9240 gives 280 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809241) 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, 22057 + ... + 22183.

It is an arithmetic number, because the mean of its divisors is an integer number (115200).

2^2809240 is an apocalyptic number.

2809240 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 2809240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3686400).

2809240 is an abundant number, since it is smaller than the sum of its proper divisors (4563560).

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

2809240 is a wasteful number, since it uses less digits than its factorization.

2809240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2809240 is about 1676.0787570994. The cubic root of 2809240 is about 141.1008449808.

The spelling of 2809240 in words is "two million, eight hundred nine thousand, two hundred forty".