115989840 has 80 divisors (see below), whose sum is σ = 399528000. Its totient is φ = 30930048.

The previous prime is 115989833. The next prime is 115989847. The reversal of 115989840 is 48989511.

115989840 is a `hidden beast` number, since 11 + 598 + 9 + 8 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (115989833) and next prime (115989847).

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

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115989847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24690 + ... + 29009.

It is an arithmetic number, because the mean of its divisors is an integer number (4994100).

Almost surely, 2^115989840 is an apocalyptic number.

115989840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115989840 is an abundant number, since it is smaller than the sum of its proper divisors (283538160).

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

115989840 is a wasteful number, since it uses less digits than its factorization.

115989840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53721 (or 53709 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 115989840 is about 10769.8579377817. The cubic root of 115989840 is about 487.6856570969.

The spelling of 115989840 in words is "one hundred fifteen million, nine hundred eighty-nine thousand, eight hundred forty".