115001220 has 24 divisors (see below), whose sum is σ = 322003584. Its totient is φ = 30666976.

The previous prime is 115001191. The next prime is 115001267. The reversal of 115001220 is 22100511.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 115001196 and 115001205.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 958284 + ... + 958403.

It is an arithmetic number, because the mean of its divisors is an integer number (13416816).

Almost surely, 2^115001220 is an apocalyptic number.

115001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115001220 is an abundant number, since it is smaller than the sum of its proper divisors (207002364).

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

115001220 is a wasteful number, since it uses less digits than its factorization.

115001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916699 (or 1916697 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 115001220 is about 10723.8621774060. The cubic root of 115001220 is about 486.2961327532.

Adding to 115001220 its reverse (22100511), we get a palindrome (137101731).

It can be divided in two parts, 11500 and 1220, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 115001220 in words is "one hundred fifteen million, one thousand, two hundred twenty".