115511440 has 60 divisors (see below), whose sum is σ = 295223292. Its totient is φ = 42000640.

The previous prime is 115511419. The next prime is 115511471. The reversal of 115511440 is 44115511.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 71368704 + 44142736 = 8448^2 + 6644^2 .

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3714 + ... + 15646.

Almost surely, 2^115511440 is an apocalyptic number.

115511440 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 115511440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147611646).

115511440 is an abundant number, since it is smaller than the sum of its proper divisors (179711852).

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

115511440 is a wasteful number, since it uses less digits than its factorization.

115511440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11968 (or 11951 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 115511440 is about 10747.6248538921. The cubic root of 115511440 is about 487.0142468078.

Adding to 115511440 its reverse (44115511), we get a palindrome (159626951).

The spelling of 115511440 in words is "one hundred fifteen million, five hundred eleven thousand, four hundred forty".