115731920 has 80 divisors (see below), whose sum is σ = 291677760. Its totient is φ = 42534912.

The previous prime is 115731911. The next prime is 115731977. The reversal of 115731920 is 29137511.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57491 + ... + 59469.

It is an arithmetic number, because the mean of its divisors is an integer number (3645972).

Almost surely, 2^115731920 is an apocalyptic number.

115731920 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 115731920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145838880).

115731920 is an abundant number, since it is smaller than the sum of its proper divisors (175945840).

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

115731920 is a wasteful number, since it uses less digits than its factorization.

115731920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052 (or 2046 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 115731920 is about 10757.8771140035. The cubic root of 115731920 is about 487.3239092265.

The spelling of 115731920 in words is "one hundred fifteen million, seven hundred thirty-one thousand, nine hundred twenty".