1163988 has 72 divisors (see below), whose sum is σ = 3494400. Its totient is φ = 319680.

The previous prime is 1163977. The next prime is 1163989. The reversal of 1163988 is 8893611.

1163988 is a `hidden beast` number, since 11 + 639 + 8 + 8 = 666.

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

Its product of digits (10368) is a multiple of the sum of its prime divisors (192).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7738 + ... + 7886.

2^1163988 is an apocalyptic number.

1163988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1163988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1747200).

1163988 is an abundant number, since it is smaller than the sum of its proper divisors (2330412).

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

1163988 is a wasteful number, since it uses less digits than its factorization.

1163988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 192 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1163988 is about 1078.8827554466. The cubic root of 1163988 is about 105.1920295445.

The spelling of 1163988 in words is "one million, one hundred sixty-three thousand, nine hundred eighty-eight".