115999381 has 8 divisors (see below), whose sum is σ = 122986944. Its totient is φ = 109030080.

The previous prime is 115999379. The next prime is 115999397. The reversal of 115999381 is 183999511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 115999381 - 2¹ = 115999379 is a prime.

It is a super-2 number, since 2×115999381² = 26911712784766322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115999361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9846 + ... + 18136.

It is an arithmetic number, because the mean of its divisors is an integer number (15373368).

Almost surely, 2^115999381 is an apocalyptic number.

It is an amenable number.

115999381 is a deficient number, since it is larger than the sum of its proper divisors (6987563).

115999381 is an equidigital number, since it uses as much as digits as its factorization.

115999381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9131.

The product of its digits is 87480, while the sum is 46.

The square root of 115999381 is about 10770.3008778771. The cubic root of 115999381 is about 487.6990286166.

The spelling of 115999381 in words is "one hundred fifteen million, nine hundred ninety-nine thousand, three hundred eighty-one".