1223505684 has 72 divisors (see below), whose sum is σ = 3263099840. Its totient is φ = 385471872.

The previous prime is 1223505671. The next prime is 1223505697. The reversal of 1223505684 is 4865053221.

It is an interprime number because it is at equal distance from previous prime (1223505671) and next prime (1223505697).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 331272 + ... + 334944.

Almost surely, 2^1223505684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223505684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1631549920).

1223505684 is an abundant number, since it is smaller than the sum of its proper divisors (2039594156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1223505684 is a wasteful number, since it uses less digits than its factorization.

1223505684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4189 (or 4184 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 1223505684 is about 34978.6461144510. The cubic root of 1223505684 is about 1069.5522288666.

The spelling of 1223505684 in words is "one billion, two hundred twenty-three million, five hundred five thousand, six hundred eighty-four".