1155123984 has 80 divisors (see below), whose sum is σ = 3520409600. Its totient is φ = 319386240.

The previous prime is 1155123961. The next prime is 1155123989. The reversal of 1155123984 is 4893215511.

It is a super-2 number, since 2×1155123984² = 2668622836824064512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1155123989) by changing a digit.

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, 45034 + ... + 65865.

It is an arithmetic number, because the mean of its divisors is an integer number (44005120).

Almost surely, 2^1155123984 is an apocalyptic number.

1155123984 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1155123984 is an abundant number, since it is smaller than the sum of its proper divisors (2365285616).

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

1155123984 is a wasteful number, since it uses less digits than its factorization.

1155123984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110948 (or 110942 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The square root of 1155123984 is about 33987.1149702354. The cubic root of 1155123984 is about 1049.2432897083.

The spelling of 1155123984 in words is "one billion, one hundred fifty-five million, one hundred twenty-three thousand, nine hundred eighty-four".