1155639884 has 48 divisors (see below), whose sum is σ = 2338828800. Its totient is φ = 489407616.

The previous prime is 1155639883. The next prime is 1155639913. The reversal of 1155639884 is 4889365511.

It is not an unprimeable number, because it can be changed into a prime (1155639883) 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, 1023032 + ... + 1024160.

It is an arithmetic number, because the mean of its divisors is an integer number (48725600).

Almost surely, 2^1155639884 is an apocalyptic number.

1155639884 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1155639884 is an abundant number, since it is smaller than the sum of its proper divisors (1183188916).

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

1155639884 is a wasteful number, since it uses less digits than its factorization.

1155639884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542 (or 1540 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 50.

The square root of 1155639884 is about 33994.7037639689. The cubic root of 1155639884 is about 1049.3994703594.

The spelling of 1155639884 in words is "one billion, one hundred fifty-five million, six hundred thirty-nine thousand, eight hundred eighty-four".