115640 has 48 divisors (see below), whose sum is σ = 307800. Its totient is φ = 38976.

The previous prime is 115637. The next prime is 115657. The reversal of 115640 is 46511.

It is a happy number.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

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, 1931 + ... + 1989.

2¹¹⁵⁶⁴⁰ is an apocalyptic number.

115640 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 115640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153900).

115640 is an abundant number, since it is smaller than the sum of its proper divisors (192160).

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

115640 is a wasteful number, since it uses less digits than its factorization.

115640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 115640 is about 340.0588184418. The cubic root of 115640 is about 48.7194856157.

The spelling of 115640 in words is "one hundred fifteen thousand, six hundred forty".