115021440 has 192 divisors, whose sum is σ = 418485600. Its totient is φ = 29030400.

The previous prime is 115021427. The next prime is 115021447. The reversal of 115021440 is 44120511.

115021440 = 1053² + 1054² + ... + 1147².

It is a tau number, because it is divible by the number of its divisors (192).

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

It is not an unprimeable number, because it can be changed into a prime (115021447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108915 + ... + 109965.

Almost surely, 2^115021440 is an apocalyptic number.

115021440 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 115021440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209242800).

115021440 is an abundant number, since it is smaller than the sum of its proper divisors (303464160).

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

115021440 is a wasteful number, since it uses less digits than its factorization.

115021440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095 (or 1080 counting only the distinct ones).

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

The square root of 115021440 is about 10724.8048933302. The cubic root of 115021440 is about 486.3246319626.

Adding to 115021440 its reverse (44120511), we get a palindrome (159141951).

The spelling of 115021440 in words is "one hundred fifteen million, twenty-one thousand, four hundred forty".