1217985 has 8 divisors (see below), whose sum is σ = 1948800. Its totient is φ = 649584.

The previous prime is 1217977. The next prime is 1217989. The reversal of 1217985 is 5897121.

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

It is not a de Polignac number, because 1217985 - 2³ = 1217977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1217989) 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, 40585 + ... + 40614.

It is an arithmetic number, because the mean of its divisors is an integer number (243600).

2^1217985 is an apocalyptic number.

1217985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1217985 is a deficient number, since it is larger than the sum of its proper divisors (730815).

1217985 is an equidigital number, since it uses as much as digits as its factorization.

1217985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81207.

The product of its digits is 5040, while the sum is 33.

The square root of 1217985 is about 1103.6235771313. The cubic root of 1217985 is about 106.7941130731.

The spelling of 1217985 in words is "one million, two hundred seventeen thousand, nine hundred eighty-five".