115299990 has 128 divisors (see below), whose sum is σ = 335301120. Its totient is φ = 28024704.

The previous prime is 115299979. The next prime is 115299991. The reversal of 115299990 is 99992511.

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 (115299991) 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 63 ways as a sum of consecutive naturals, for example, 375417 + ... + 375723.

It is an arithmetic number, because the mean of its divisors is an integer number (2619540).

Almost surely, 2^115299990 is an apocalyptic number.

115299990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 115299990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167650560).

115299990 is an abundant number, since it is smaller than the sum of its proper divisors (220001130).

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

115299990 is a wasteful number, since it uses less digits than its factorization.

115299990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 45.

The square root of 115299990 is about 10737.7832907914. The cubic root of 115299990 is about 486.7168965690.

The spelling of 115299990 in words is "one hundred fifteen million, two hundred ninety-nine thousand, nine hundred ninety".