115540240 has 40 divisors (see below), whose sum is σ = 271029528. Its totient is φ = 45803520.

The previous prime is 115540219. The next prime is 115540253. The reversal of 115540240 is 42045511.

115540240 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 4 ways, for example, as 1648656 + 113891584 = 1284^2 + 10672^2 .

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

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, 2650 + ... + 15430.

Almost surely, 2^115540240 is an apocalyptic number.

115540240 is a gapful number since it is divisible by the number (10) 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 115540240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135514764).

115540240 is an abundant number, since it is smaller than the sum of its proper divisors (155489288).

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

115540240 is a wasteful number, since it uses less digits than its factorization.

115540240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12907 (or 12901 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 115540240 is about 10748.9646013000. The cubic root of 115540240 is about 487.0547185417.

Adding to 115540240 its reverse (42045511), we get a palindrome (157585751).

The spelling of 115540240 in words is "one hundred fifteen million, five hundred forty thousand, two hundred forty".