1155232140 has 48 divisors (see below), whose sum is σ = 3264344160. Its totient is φ = 305233920.

The previous prime is 1155232121. The next prime is 1155232147. The reversal of 1155232140 is 412325511.

It is a happy number.

It is a super-2 number, since 2×1155232140² = 2669122594577959200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1155232140.

It is not an unprimeable number, because it can be changed into a prime (1155232147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81781 + ... + 94860.

It is an arithmetic number, because the mean of its divisors is an integer number (68007170).

Almost surely, 2^1155232140 is an apocalyptic number.

1155232140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155232140 is an abundant number, since it is smaller than the sum of its proper divisors (2109112020).

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

1155232140 is a wasteful number, since it uses less digits than its factorization.

1155232140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176762 (or 176760 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1155232140 is about 33988.7060653977. The cubic root of 1155232140 is about 1049.2760360967.

Adding to 1155232140 its reverse (412325511), we get a palindrome (1567557651).

The spelling of 1155232140 in words is "one billion, one hundred fifty-five million, two hundred thirty-two thousand, one hundred forty".