1223747565 has 8 divisors (see below), whose sum is σ = 1957996128. Its totient is φ = 652665360.

The previous prime is 1223747561. The next prime is 1223747587. The reversal of 1223747565 is 5657473221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1223747565 - 2² = 1223747561 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223747561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40791571 + ... + 40791600.

It is an arithmetic number, because the mean of its divisors is an integer number (244749516).

Almost surely, 2^1223747565 is an apocalyptic number.

1223747565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1223747565 is a deficient number, since it is larger than the sum of its proper divisors (734248563).

1223747565 is an equidigital number, since it uses as much as digits as its factorization.

1223747565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81583179.

The product of its digits is 352800, while the sum is 42.

The square root of 1223747565 is about 34982.1034959306. The cubic root of 1223747565 is about 1069.6227059445.

The spelling of 1223747565 in words is "one billion, two hundred twenty-three million, seven hundred forty-seven thousand, five hundred sixty-five".