115559820 has 144 divisors (see below), whose sum is σ = 370685952. Its totient is φ = 29082240.

The previous prime is 115559783. The next prime is 115559831. The reversal of 115559820 is 28955511.

It is a happy number.

115559820 is a `hidden beast` number, since 11 + 55 + 598 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 426285 + ... + 426555.

It is an arithmetic number, because the mean of its divisors is an integer number (2574208).

Almost surely, 2^115559820 is an apocalyptic number.

115559820 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 115559820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185342976).

115559820 is an abundant number, since it is smaller than the sum of its proper divisors (255126132).

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

115559820 is a wasteful number, since it uses less digits than its factorization.

115559820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 36.

The square root of 115559820 is about 10749.8753481145. The cubic root of 115559820 is about 487.0822298593.

The spelling of 115559820 in words is "one hundred fifteen million, five hundred fifty-nine thousand, eight hundred twenty".