2099440 has 80 divisors (see below), whose sum is σ = 5856768. Its totient is φ = 684288.

The previous prime is 2099431. The next prime is 2099441. The reversal of 2099440 is 449902.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 2099399 and 2099408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2099441) 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, 12799 + ... + 12961.

2^2099440 is an apocalyptic number.

2099440 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 2099440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2928384).

2099440 is an abundant number, since it is smaller than the sum of its proper divisors (3757328).

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

2099440 is a wasteful number, since it uses less digits than its factorization.

2099440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 2099440 is about 1448.9444433794. The cubic root of 2099440 is about 128.0465325609.

The spelling of 2099440 in words is "two million, ninety-nine thousand, four hundred forty".