1223979 has 4 divisors (see below), whose sum is σ = 1631976. Its totient is φ = 815984.

The previous prime is 1223977. The next prime is 1223987. The reversal of 1223979 is 9793221.

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 1223979 - 2¹ = 1223977 is a prime.

It is a D-number.

1223979 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1223977) 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, 203994 + ... + 203999.

It is an arithmetic number, because the mean of its divisors is an integer number (407994).

2^1223979 is an apocalyptic number.

1223979 is a deficient number, since it is larger than the sum of its proper divisors (407997).

1223979 is an equidigital number, since it uses as much as digits as its factorization.

1223979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407996.

The product of its digits is 6804, while the sum is 33.

The square root of 1223979 is about 1106.3358441269. The cubic root of 1223979 is about 106.9690130669.

The spelling of 1223979 in words is "one million, two hundred twenty-three thousand, nine hundred seventy-nine".