1223555764 has 6 divisors (see below), whose sum is σ = 2141222594. Its totient is φ = 611777880.

The previous prime is 1223555761. The next prime is 1223555783. The reversal of 1223555764 is 4675553221.

It can be written as a sum of positive squares in only one way, i.e., 767733264 + 455822500 = 27708^2 + 21350^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223555761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152944467 + ... + 152944474.

Almost surely, 2^1223555764 is an apocalyptic number.

It is an amenable number.

1223555764 is a deficient number, since it is larger than the sum of its proper divisors (917666830).

1223555764 is a wasteful number, since it uses less digits than its factorization.

1223555764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305888945 (or 305888943 counting only the distinct ones).

The product of its digits is 252000, while the sum is 40.

The square root of 1223555764 is about 34979.3619724546. The cubic root of 1223555764 is about 1069.5668214823.

The spelling of 1223555764 in words is "one billion, two hundred twenty-three million, five hundred fifty-five thousand, seven hundred sixty-four".