115403220 has 36 divisors (see below), whose sum is σ = 350056980. Its totient is φ = 30774144.

The previous prime is 115403203. The next prime is 115403227. The reversal of 115403220 is 22304511.

It can be written as a sum of positive squares in 2 ways, for example, as 54375876 + 61027344 = 7374^2 + 7812^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 115403193 and 115403202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115403227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 320385 + ... + 320744.

It is an arithmetic number, because the mean of its divisors is an integer number (9723805).

Almost surely, 2^115403220 is an apocalyptic number.

115403220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115403220 is an abundant number, since it is smaller than the sum of its proper divisors (234653760).

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

115403220 is a wasteful number, since it uses less digits than its factorization.

115403220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641144 (or 641139 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 115403220 is about 10742.5890734031. The cubic root of 115403220 is about 486.8621084867.

Adding to 115403220 its reverse (22304511), we get a palindrome (137707731).

The spelling of 115403220 in words is "one hundred fifteen million, four hundred three thousand, two hundred twenty".