1115421888 has 168 divisors, whose sum is σ = 3499390512. Its totient is φ = 312539136.

The previous prime is 1115421887. The next prime is 1115421889. The reversal of 1115421888 is 8881245111.

It is an interprime number because it is at equal distance from previous prime (1115421887) and next prime (1115421889).

It is a tau number, because it is divible by the number of its divisors (168).

It is not an unprimeable number, because it can be changed into a prime (1115421887) 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, 497506 + ... + 499742.

Almost surely, 2^1115421888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1115421888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1749695256).

1115421888 is an abundant number, since it is smaller than the sum of its proper divisors (2383968624).

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

1115421888 is a wasteful number, since it uses less digits than its factorization.

1115421888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319 (or 2302 counting only the distinct ones).

The product of its digits is 20480, while the sum is 39.

The square root of 1115421888 is about 33397.9323910927. The cubic root of 1115421888 is about 1037.0818987506.

Adding to 1115421888 its reverse (8881245111), we get a palindrome (9996666999).

The spelling of 1115421888 in words is "one billion, one hundred fifteen million, four hundred twenty-one thousand, eight hundred eighty-eight".