1155949920 has 96 divisors (see below), whose sum is σ = 4045839840. Its totient is φ = 308252160.

The previous prime is 1155949919. The next prime is 1155949933. The reversal of 1155949920 is 299495511.

1155949920 is a `hidden beast` number, since 1 + 1 + 559 + 4 + 9 + 92 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 129471 + ... + 138110.

It is an arithmetic number, because the mean of its divisors is an integer number (42144165).

Almost surely, 2^1155949920 is an apocalyptic number.

1155949920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155949920 is an abundant number, since it is smaller than the sum of its proper divisors (2889889920).

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

1155949920 is a wasteful number, since it uses less digits than its factorization.

1155949920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267605 (or 267591 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 45.

The square root of 1155949920 is about 33999.2635214353. The cubic root of 1155949920 is about 1049.4933065471.

The spelling of 1155949920 in words is "one billion, one hundred fifty-five million, nine hundred forty-nine thousand, nine hundred twenty".