115415440 has 80 divisors (see below), whose sum is σ = 313872768. Its totient is φ = 38642688.

The previous prime is 115415437. The next prime is 115415471. The reversal of 115415440 is 44514511.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21684 + ... + 26476.

Almost surely, 2^115415440 is an apocalyptic number.

115415440 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 115415440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156936384).

115415440 is an abundant number, since it is smaller than the sum of its proper divisors (198457328).

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

115415440 is a wasteful number, since it uses less digits than its factorization.

115415440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4856 (or 4850 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 115415440 is about 10743.1578225399. The cubic root of 115415440 is about 486.8792924237.

Adding to 115415440 its reverse (44514511), we get a palindrome (159929951).

The spelling of 115415440 in words is "one hundred fifteen million, four hundred fifteen thousand, four hundred forty".