2015440240 has 80 divisors (see below), whose sum is σ = 5151206016. Its totient is φ = 727251200.

The previous prime is 2015440237. The next prime is 2015440277. The reversal of 2015440240 is 420445102.

It is a happy number.

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

It is a super-2 number, since 2×2015440240² = 8123998722022515200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106539 + ... + 124021.

Almost surely, 2^2015440240 is an apocalyptic number.

2015440240 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 2015440240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2575603008).

2015440240 is an abundant number, since it is smaller than the sum of its proper divisors (3135765776).

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

2015440240 is a wasteful number, since it uses less digits than its factorization.

2015440240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17638 (or 17632 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 2015440240 is about 44893.6547855039. The cubic root of 2015440240 is about 1263.1549892160.

Adding to 2015440240 its reverse (420445102), we get a palindrome (2435885342).

The spelling of 2015440240 in words is "two billion, fifteen million, four hundred forty thousand, two hundred forty".