1181385268 has 72 divisors (see below), whose sum is σ = 2548432320. Its totient is φ = 468115200.

The previous prime is 1181385253. The next prime is 1181385269. The reversal of 1181385268 is 8625831811.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181385269) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 983068 + ... + 984268.

Almost surely, 2^1181385268 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1181385268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1274216160).

1181385268 is an abundant number, since it is smaller than the sum of its proper divisors (1367047052).

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

1181385268 is a wasteful number, since it uses less digits than its factorization.

1181385268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317 (or 1272 counting only the distinct ones).

The product of its digits is 92160, while the sum is 43.

The square root of 1181385268 is about 34371.2855156743. The cubic root of 1181385268 is about 1057.1351584921.

The spelling of 1181385268 in words is "one billion, one hundred eighty-one million, three hundred eighty-five thousand, two hundred sixty-eight".