1220764 has 12 divisors (see below), whose sum is σ = 2162664. Its totient is φ = 602864.

The previous prime is 1220761. The next prime is 1220773. The reversal of 1220764 is 4670221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220761) 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, 1507 + ... + 2170.

It is an arithmetic number, because the mean of its divisors is an integer number (180222).

2^1220764 is an apocalyptic number.

It is an amenable number.

1220764 is a deficient number, since it is larger than the sum of its proper divisors (941900).

1220764 is a wasteful number, since it uses less digits than its factorization.

1220764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3764 (or 3762 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 1220764 is about 1104.8818941407. The cubic root of 1220764 is about 106.8752731888.

Adding to 1220764 its reverse (4670221), we get a palindrome (5890985).

The spelling of 1220764 in words is "one million, two hundred twenty thousand, seven hundred sixty-four".