1155403240 has 16 divisors (see below), whose sum is σ = 2599657380. Its totient is φ = 462161280.

The previous prime is 1155403237. The next prime is 1155403259. The reversal of 1155403240 is 423045511.

It is a happy number.

1155403240 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 2 ways, for example, as 973315204 + 182088036 = 31198^2 + 13494^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14442501 + ... + 14442580.

Almost surely, 2^1155403240 is an apocalyptic number.

1155403240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155403240 is an abundant number, since it is smaller than the sum of its proper divisors (1444254140).

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

1155403240 is a wasteful number, since it uses less digits than its factorization.

1155403240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28885092 (or 28885088 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1155403240 is about 33991.2229847648. Note that the first 3 decimals coincide. The cubic root of 1155403240 is about 1049.3278358637.

Adding to 1155403240 its reverse (423045511), we get a palindrome (1578448751).

The spelling of 1155403240 in words is "one billion, one hundred fifty-five million, four hundred three thousand, two hundred forty".