115221240 has 192 divisors, whose sum is σ = 403846560. Its totient is φ = 28385280.

The previous prime is 115221233. The next prime is 115221251. The reversal of 115221240 is 42122511.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 409900 + ... + 410180.

Almost surely, 2^115221240 is an apocalyptic number.

115221240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 115221240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201923280).

115221240 is an abundant number, since it is smaller than the sum of its proper divisors (288625320).

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

115221240 is a wasteful number, since it uses less digits than its factorization.

115221240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 115221240 is about 10734.1157064753. The cubic root of 115221240 is about 486.6060619680.

Adding to 115221240 its reverse (42122511), we get a palindrome (157343751).

The spelling of 115221240 in words is "one hundred fifteen million, two hundred twenty-one thousand, two hundred forty".