2140240 has 40 divisors (see below), whose sum is σ = 5142528. Its totient is φ = 827520.

The previous prime is 2140231. The next prime is 2140253. The reversal of 2140240 is 420412.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 2140240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2049 + ... + 2911.

2^2140240 is an apocalyptic number.

2140240 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 2140240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2571264).

2140240 is an abundant number, since it is smaller than the sum of its proper divisors (3002288).

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

2140240 is a wasteful number, since it uses less digits than its factorization.

2140240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2140240 is about 1462.9559118442. The cubic root of 2140240 is about 128.8706914900.

Adding to 2140240 its reverse (420412), we get a palindrome (2560652).

The spelling of 2140240 in words is "two million, one hundred forty thousand, two hundred forty".