1155400000 has 168 divisors, whose sum is σ = 2946608280. Its totient is φ = 449280000.

The previous prime is 1155399941. The next prime is 1155400003. The reversal of 1155400000 is 45511.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 1082673216 + 72726784 = 32904^2 + 8528^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155400003) 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, 10599946 + ... + 10600054.

It is an arithmetic number, because the mean of its divisors is an integer number (17539335).

Almost surely, 2^1155400000 is an apocalyptic number.

1155400000 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 1155400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1473304140).

1155400000 is an abundant number, since it is smaller than the sum of its proper divisors (1791208280).

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

1155400000 is an frugal number, since it uses more digits than its factorization.

1155400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 1155400000 is about 33991.1753253694. The cubic root of 1155400000 is about 1049.3268550155.

Adding to 1155400000 its reverse (45511), we get a palindrome (1155445511).

The spelling of 1155400000 in words is "one billion, one hundred fifty-five million, four hundred thousand".