1217995 has 8 divisors (see below), whose sum is σ = 1538640. Its totient is φ = 923040.

The previous prime is 1217989. The next prime is 1218017. The reversal of 1217995 is 5997121.

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

It is not a de Polignac number, because 1217995 - 2⁵ = 1217963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1217995.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6316 + ... + 6505.

It is an arithmetic number, because the mean of its divisors is an integer number (192330).

2^1217995 is an apocalyptic number.

1217995 is a deficient number, since it is larger than the sum of its proper divisors (320645).

1217995 is a wasteful number, since it uses less digits than its factorization.

1217995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12845.

The product of its digits is 5670, while the sum is 34.

The square root of 1217995 is about 1103.6281076522. The cubic root of 1217995 is about 106.7944053422.

The spelling of 1217995 in words is "one million, two hundred seventeen thousand, nine hundred ninety-five".