1155949272 has 128 divisors (see below), whose sum is σ = 3547929600. Its totient is φ = 346857984.

The previous prime is 1155949271. The next prime is 1155949279. The reversal of 1155949272 is 2729495511.

1155949272 is a `hidden beast` number, since 1 + 1 + 559 + 4 + 92 + 7 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155949271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77613 + ... + 91299.

It is an arithmetic number, because the mean of its divisors is an integer number (27718200).

Almost surely, 2^1155949272 is an apocalyptic number.

1155949272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1155949272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1773964800).

1155949272 is an abundant number, since it is smaller than the sum of its proper divisors (2391980328).

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

1155949272 is a wasteful number, since it uses less digits than its factorization.

1155949272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13742 (or 13732 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 1155949272 is about 33999.2539918158. The cubic root of 1155949272 is about 1049.4931104395.

The spelling of 1155949272 in words is "one billion, one hundred fifty-five million, nine hundred forty-nine thousand, two hundred seventy-two".