1155212040 has 32 divisors (see below), whose sum is σ = 3465636480. Its totient is φ = 308056512.

The previous prime is 1155212021. The next prime is 1155212041. The reversal of 1155212040 is 402125511.

It is a junction number, because it is equal to n+sod(n) for n = 1155211998 and 1155212016.

It is not an unprimeable number, because it can be changed into a prime (1155212041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4813264 + ... + 4813503.

It is an arithmetic number, because the mean of its divisors is an integer number (108301140).

Almost surely, 2^1155212040 is an apocalyptic number.

1155212040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155212040 is an abundant number, since it is smaller than the sum of its proper divisors (2310424440).

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

1155212040 is a wasteful number, since it uses less digits than its factorization.

1155212040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9626781 (or 9626777 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1155212040 is about 33988.4103776567. The cubic root of 1155212040 is about 1049.2699505750.

Adding to 1155212040 its reverse (402125511), we get a palindrome (1557337551).

The spelling of 1155212040 in words is "one billion, one hundred fifty-five million, two hundred twelve thousand, forty".