1220756 has 12 divisors (see below), whose sum is σ = 2157792. Its totient is φ = 604248.

The previous prime is 1220743. The next prime is 1220761. The reversal of 1220756 is 6570221.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1070 + ... + 1893.

It is an arithmetic number, because the mean of its divisors is an integer number (179816).

2^1220756 is an apocalyptic number.

It is an amenable number.

1220756 is a deficient number, since it is larger than the sum of its proper divisors (937036).

1220756 is a wasteful number, since it uses less digits than its factorization.

1220756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3070 (or 3068 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 1220756 is about 1104.8782738383. The cubic root of 1220756 is about 106.8750397273.

Adding to 1220756 its reverse (6570221), we get a palindrome (7790977).

The spelling of 1220756 in words is "one million, two hundred twenty thousand, seven hundred fifty-six".