1217879 has 4 divisors (see below), whose sum is σ = 1311576. Its totient is φ = 1124184.

The previous prime is 1217861. The next prime is 1217893. The reversal of 1217879 is 9787121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1217879 - 2¹⁶ = 1152343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217809) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 46829 + ... + 46854.

It is an arithmetic number, because the mean of its divisors is an integer number (327894).

2^1217879 is an apocalyptic number.

1217879 is a deficient number, since it is larger than the sum of its proper divisors (93697).

1217879 is an equidigital number, since it uses as much as digits as its factorization.

1217879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93696.

The product of its digits is 7056, while the sum is 35.

The square root of 1217879 is about 1103.5755524657. The cubic root of 1217879 is about 106.7910149221.

It can be divided in two parts, 121 and 7879, that multiplied together give a palindrome (953359).

The spelling of 1217879 in words is "one million, two hundred seventeen thousand, eight hundred seventy-nine".