115721298 has 80 divisors (see below), whose sum is σ = 323319744. Its totient is φ = 30054240.

The previous prime is 115721273. The next prime is 115721317. The reversal of 115721298 is 892127511.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7836 + ... + 17112.

Almost surely, 2^115721298 is an apocalyptic number.

115721298 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 115721298, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161659872).

115721298 is an abundant number, since it is smaller than the sum of its proper divisors (207598446).

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

115721298 is a wasteful number, since it uses less digits than its factorization.

115721298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9309 (or 9300 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 115721298 is about 10757.3834179135. The cubic root of 115721298 is about 487.3089997330.

The spelling of 115721298 in words is "one hundred fifteen million, seven hundred twenty-one thousand, two hundred ninety-eight".