1109988 has 36 divisors (see below), whose sum is σ = 3061968. Its totient is φ = 336240.

The previous prime is 1109987. The next prime is 1110007. The reversal of 1109988 is 8899011.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1109987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1006 + ... + 1797.

2^1109988 is an apocalyptic number.

1109988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1109988 is an abundant number, since it is smaller than the sum of its proper divisors (1951980).

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

1109988 is a wasteful number, since it uses less digits than its factorization.

1109988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824 (or 2819 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1109988 is about 1053.5596803219. The cubic root of 1109988 is about 103.5395074268.

The spelling of 1109988 in words is "one million, one hundred nine thousand, nine hundred eighty-eight".