115221440 has 84 divisors (see below), whose sum is σ = 282052776. Its totient is φ = 44831232.

The previous prime is 115221433. The next prime is 115221473. The reversal of 115221440 is 44122511.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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 11 ways as a sum of consecutive naturals, for example, 706799 + ... + 706961.

Almost surely, 2^115221440 is an apocalyptic number.

115221440 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 115221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141026388).

115221440 is an abundant number, since it is smaller than the sum of its proper divisors (166831336).

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

115221440 is an equidigital number, since it uses as much as digits as its factorization.

115221440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 115221440 is about 10734.1250225624. The cubic root of 115221440 is about 486.6063435167.

Adding to 115221440 its reverse (44122511), we get a palindrome (159343951).

It can be divided in two parts, 11522 and 1440, that multiplied together give a triangular number (16591680 = T₅₇₆₀).

The spelling of 115221440 in words is "one hundred fifteen million, two hundred twenty-one thousand, four hundred forty".