1171989 has 48 divisors (see below), whose sum is σ = 2201472. Its totient is φ = 606528.

The previous prime is 1171981. The next prime is 1171991. The reversal of 1171989 is 9891711.

It is not a de Polignac number, because 1171989 - 2³ = 1171981 is a prime.

It is a super-2 number, since 2×1171989² = 2747116432242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22087 + ... + 22139.

It is an arithmetic number, because the mean of its divisors is an integer number (45864).

2^1171989 is an apocalyptic number.

It is an amenable number.

1171989 is a deficient number, since it is larger than the sum of its proper divisors (1029483).

1171989 is an equidigital number, since it uses as much as digits as its factorization.

1171989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 76 counting only the distinct ones).

The product of its digits is 4536, while the sum is 36.

The square root of 1171989 is about 1082.5844077946. The cubic root of 1171989 is about 105.4325017656.

The spelling of 1171989 in words is "one million, one hundred seventy-one thousand, nine hundred eighty-nine".