1220979 has 4 divisors (see below), whose sum is σ = 1627976. Its totient is φ = 813984.

The previous prime is 1220969. The next prime is 1220981. The reversal of 1220979 is 9790221.

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

It is not a de Polignac number, because 1220979 - 2¹³ = 1212787 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203494 + ... + 203499.

It is an arithmetic number, because the mean of its divisors is an integer number (406994).

2^1220979 is an apocalyptic number.

1220979 is a deficient number, since it is larger than the sum of its proper divisors (406997).

1220979 is an equidigital number, since it uses as much as digits as its factorization.

1220979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406996.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 1220979 is about 1104.9791853243. The cubic root of 1220979 is about 106.8815470836.

The spelling of 1220979 in words is "one million, two hundred twenty thousand, nine hundred seventy-nine".