1220779 has 8 divisors (see below), whose sum is σ = 1414880. Its totient is φ = 1031616.

The previous prime is 1220777. The next prime is 1220783. The reversal of 1220779 is 9770221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1220779 - 2¹ = 1220777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684 + ... + 1705.

It is an arithmetic number, because the mean of its divisors is an integer number (176860).

2^1220779 is an apocalyptic number.

1220779 is a deficient number, since it is larger than the sum of its proper divisors (194101).

1220779 is an equidigital number, since it uses as much as digits as its factorization.

1220779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 1220779 is about 1104.8886821757. Note that the first 3 decimals coincide. The cubic root of 1220779 is about 106.8757109263.

It can be divided in two parts, 1 and 220779, that added together give a triangular number (220780 = T₆₆₄).

The spelling of 1220779 in words is "one million, two hundred twenty thousand, seven hundred seventy-nine".