115721839 has 8 divisors (see below), whose sum is σ = 123720480. Its totient is φ = 107855616.

The previous prime is 115721821. The next prime is 115721867. The reversal of 115721839 is 938127511.

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

It is not a de Polignac number, because 115721839 - 2⁹ = 115721327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115721798 and 115721807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115721869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31294 + ... + 34795.

It is an arithmetic number, because the mean of its divisors is an integer number (15465060).

Almost surely, 2^115721839 is an apocalyptic number.

115721839 is a deficient number, since it is larger than the sum of its proper divisors (7998641).

115721839 is a wasteful number, since it uses less digits than its factorization.

115721839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66209.

The product of its digits is 15120, while the sum is 37.

The square root of 115721839 is about 10757.4085634041. The cubic root of 115721839 is about 487.3097591257.

The spelling of 115721839 in words is "one hundred fifteen million, seven hundred twenty-one thousand, eight hundred thirty-nine".