1100999988 has 36 divisors (see below), whose sum is σ = 3036091968. Its totient is φ = 333636240.

The previous prime is 1100999987. The next prime is 1100999989. The reversal of 1100999988 is 8899990011.

It is an interprime number because it is at equal distance from previous prime (1100999987) and next prime (1100999989).

It is a tau number, because it is divible by the number of its divisors (36).

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100999981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1389756 + ... + 1390547.

It is an arithmetic number, because the mean of its divisors is an integer number (84335888).

Almost surely, 2^1100999988 is an apocalyptic number.

1100999988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1100999988 is an abundant number, since it is smaller than the sum of its proper divisors (1935091980).

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

1100999988 is a wasteful number, since it uses less digits than its factorization.

1100999988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780324 (or 2780319 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 54.

The square root of 1100999988 is about 33181.3198652495. The cubic root of 1100999988 is about 1032.5928291174.

The spelling of 1100999988 in words is "one billion, one hundred million, nine hundred ninety-nine thousand, nine hundred eighty-eight".