1220776 has 8 divisors (see below), whose sum is σ = 2288970. Its totient is φ = 610384.

The previous prime is 1220773. The next prime is 1220777. The reversal of 1220776 is 6770221.

It can be written as a sum of positive squares in only one way, i.e., 1052676 + 168100 = 1026^2 + 410^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1220776.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76291 + ... + 76306.

2^1220776 is an apocalyptic number.

It is an amenable number.

1220776 is a deficient number, since it is larger than the sum of its proper divisors (1068194).

1220776 is a wasteful number, since it uses less digits than its factorization.

1220776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152603 (or 152599 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 1220776 is about 1104.8873245721. The cubic root of 1220776 is about 106.8756233791.

Adding to 1220776 its reverse (6770221), we get a palindrome (7990997).

The spelling of 1220776 in words is "one million, two hundred twenty thousand, seven hundred seventy-six".