1223913 has 4 divisors (see below), whose sum is σ = 1631888. Its totient is φ = 815940.

The previous prime is 1223897. The next prime is 1223921. The reversal of 1223913 is 3193221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3193221 = 3 ⋅1064407.

It is not a de Polignac number, because 1223913 - 2⁴ = 1223897 is a prime.

It is a D-number.

It is a Duffinian number.

1223913 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1223913.

It is not an unprimeable number, because it can be changed into a prime (1223953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203983 + ... + 203988.

It is an arithmetic number, because the mean of its divisors is an integer number (407972).

2^1223913 is an apocalyptic number.

It is an amenable number.

1223913 is a deficient number, since it is larger than the sum of its proper divisors (407975).

1223913 is an equidigital number, since it uses as much as digits as its factorization.

1223913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407974.

The product of its digits is 324, while the sum is 21.

The square root of 1223913 is about 1106.3060155310. The cubic root of 1223913 is about 106.9670903537.

The spelling of 1223913 in words is "one million, two hundred twenty-three thousand, nine hundred thirteen".