115691440 has 80 divisors (see below), whose sum is σ = 284446080. Its totient is φ = 43688960.

The previous prime is 115691419. The next prime is 115691453. The reversal of 115691440 is 44196511.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108510 + ... + 109570.

It is an arithmetic number, because the mean of its divisors is an integer number (3555576).

Almost surely, 2^115691440 is an apocalyptic number.

115691440 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 115691440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142223040).

115691440 is an abundant number, since it is smaller than the sum of its proper divisors (168754640).

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

115691440 is a wasteful number, since it uses less digits than its factorization.

115691440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 115691440 is about 10755.9955373736. The cubic root of 115691440 is about 487.2670848797.

The spelling of 115691440 in words is "one hundred fifteen million, six hundred ninety-one thousand, four hundred forty".