1223523306 has 20 divisors (see below), whose sum is σ = 2741598882. Its totient is φ = 407841048.

The previous prime is 1223523293. The next prime is 1223523313. The reversal of 1223523306 is 6033253221.

1223523306 is a `hidden beast` number, since 1 + 2 + 2 + 352 + 3 + 306 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1041030225 + 182493081 = 32265^2 + 13509^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1223523306.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3776145 + ... + 3776468.

Almost surely, 2^1223523306 is an apocalyptic number.

1223523306 is an abundant number, since it is smaller than the sum of its proper divisors (1518075576).

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

1223523306 is an equidigital number, since it uses as much as digits as its factorization.

1223523306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7552627 (or 7552618 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 1223523306 is about 34978.8980100860. The cubic root of 1223523306 is about 1069.5573637178.

Adding to 1223523306 its reverse (6033253221), we get a palindrome (7256776527).

The spelling of 1223523306 in words is "one billion, two hundred twenty-three million, five hundred twenty-three thousand, three hundred six".