1223804993 has 4 divisors (see below), whose sum is σ = 1295793540. Its totient is φ = 1151816448.

The previous prime is 1223804987. The next prime is 1223805041. The reversal of 1223804993 is 3994083221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 391367089 + 832437904 = 19783^2 + 28852^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223804993 - 2¹⁰ = 1223803969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1223804993.

It is not an unprimeable number, because it can be changed into a prime (1223804093) 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, 35994248 + ... + 35994281.

It is an arithmetic number, because the mean of its divisors is an integer number (323948385).

Almost surely, 2^1223804993 is an apocalyptic number.

It is an amenable number.

1223804993 is a deficient number, since it is larger than the sum of its proper divisors (71988547).

1223804993 is an equidigital number, since it uses as much as digits as its factorization.

1223804993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71988546.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 1223804993 is about 34982.9243060096. The cubic root of 1223804993 is about 1069.6394374267.

The spelling of 1223804993 in words is "one billion, two hundred twenty-three million, eight hundred four thousand, nine hundred ninety-three".