1115520400 has 120 divisors (see below), whose sum is σ = 2898068480. Its totient is φ = 411194880.

The previous prime is 1115520397. The next prime is 1115520403. The reversal of 1115520400 is 40255111.

It is an interprime number because it is at equal distance from previous prime (1115520397) and next prime (1115520403).

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (1115520403) 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, 279217 + ... + 283183.

Almost surely, 2^1115520400 is an apocalyptic number.

1115520400 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 1115520400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1449034240).

1115520400 is an abundant number, since it is smaller than the sum of its proper divisors (1782548080).

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

1115520400 is a wasteful number, since it uses less digits than its factorization.

1115520400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041 (or 4030 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 1115520400 is about 33399.4071803677. The cubic root of 1115520400 is about 1037.1124289042.

Adding to 1115520400 its reverse (40255111), we get a palindrome (1155775511).

The spelling of 1115520400 in words is "one billion, one hundred fifteen million, five hundred twenty thousand, four hundred".