1155531400 has 24 divisors (see below), whose sum is σ = 2686610970. Its totient is φ = 462212480.

The previous prime is 1155531383. The next prime is 1155531401. The reversal of 1155531400 is 41355511.

It is a happy number.

1155531400 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 928908484 + 226622916 = 30478^2 + 15054^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1155531401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2888629 + ... + 2889028.

Almost surely, 2^1155531400 is an apocalyptic number.

1155531400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155531400 is an abundant number, since it is smaller than the sum of its proper divisors (1531079570).

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

1155531400 is a wasteful number, since it uses less digits than its factorization.

1155531400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5777673 (or 5777664 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1155531400 is about 33993.1081250303. The cubic root of 1155531400 is about 1049.3666323862.

Adding to 1155531400 its reverse (41355511), we get a palindrome (1196886911).

The spelling of 1155531400 in words is "one billion, one hundred fifty-five million, five hundred thirty-one thousand, four hundred".