1155205540 has 24 divisors (see below), whose sum is σ = 2426598720. Its totient is φ = 461955168.

The previous prime is 1155205511. The next prime is 1155205549. The reversal of 1155205540 is 455025511.

It is a junction number, because it is equal to n+sod(n) for n = 1155205499 and 1155205508.

It is not an unprimeable number, because it can be changed into a prime (1155205549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107659 + ... + 117901.

It is an arithmetic number, because the mean of its divisors is an integer number (101108280).

Almost surely, 2^1155205540 is an apocalyptic number.

1155205540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155205540 is an abundant number, since it is smaller than the sum of its proper divisors (1271393180).

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

1155205540 is a wasteful number, since it uses less digits than its factorization.

1155205540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15891 (or 15889 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 1155205540 is about 33988.3147566925. The cubic root of 1155205540 is about 1049.2679826051.

The spelling of 1155205540 in words is "one billion, one hundred fifty-five million, two hundred five thousand, five hundred forty".