1115385720 has 128 divisors (see below), whose sum is σ = 3454747200. Its totient is φ = 287870976.

The previous prime is 1115385707. The next prime is 1115385721. The reversal of 1115385720 is 275835111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115385721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1016212 + ... + 1017308.

Almost surely, 2^1115385720 is an apocalyptic number.

1115385720 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 1115385720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1727373600).

1115385720 is an abundant number, since it is smaller than the sum of its proper divisors (2339361480).

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

1115385720 is a wasteful number, since it uses less digits than its factorization.

1115385720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377 (or 1373 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 1115385720 is about 33397.3909160581. The cubic root of 1115385720 is about 1037.0706893646.

The spelling of 1115385720 in words is "one billion, one hundred fifteen million, three hundred eighty-five thousand, seven hundred twenty".