1171985 has 8 divisors (see below), whose sum is σ = 1440936. Its totient is φ = 914560.

The previous prime is 1171981. The next prime is 1171991. The reversal of 1171985 is 5891711.

It can be written as a sum of positive squares in 4 ways, for example, as 7744 + 1164241 = 88^2 + 1079^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1171985 - 2² = 1171981 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 2654 + ... + 3063.

It is an arithmetic number, because the mean of its divisors is an integer number (180117).

2^1171985 is an apocalyptic number.

It is an amenable number.

1171985 is a deficient number, since it is larger than the sum of its proper divisors (268951).

1171985 is an equidigital number, since it uses as much as digits as its factorization.

1171985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5763.

The product of its digits is 2520, while the sum is 32.

The square root of 1171985 is about 1082.5825603620. The cubic root of 1171985 is about 105.4323818184.

The spelling of 1171985 in words is "one million, one hundred seventy-one thousand, nine hundred eighty-five".