1209979 has 2 divisors, whose sum is σ = 1209980. Its totient is φ = 1209978.

The previous prime is 1209973. The next prime is 1210003. The reversal of 1209979 is 9799021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1209979 - 2⁵ = 1209947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1209973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604989 + 604990.

It is an arithmetic number, because the mean of its divisors is an integer number (604990).

2^1209979 is an apocalyptic number.

1209979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209979 is an equidigital number, since it uses as much as digits as its factorization.

1209979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 1209979 is about 1099.9904545040. The cubic root of 1209979 is about 106.5596072090.

The spelling of 1209979 in words is "one million, two hundred nine thousand, nine hundred seventy-nine".