1223557889 has 4 divisors (see below), whose sum is σ = 1224622080. Its totient is φ = 1222493700.

The previous prime is 1223557883. The next prime is 1223557913. The reversal of 1223557889 is 9887553221.

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.

It is a cyclic number.

It is not a de Polignac number, because 1223557889 - 2⁴ = 1223557873 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1223557883) by changing a digit.

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

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530369 + ... + 532670.

It is an arithmetic number, because the mean of its divisors is an integer number (306155520).

Almost surely, 2^1223557889 is an apocalyptic number.

It is an amenable number.

1223557889 is a deficient number, since it is larger than the sum of its proper divisors (1064191).

1223557889 is a wasteful number, since it uses less digits than its factorization.

1223557889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064190.

The product of its digits is 1209600, while the sum is 50.

The square root of 1223557889 is about 34979.3923474951. The cubic root of 1223557889 is about 1069.5674406689.

The spelling of 1223557889 in words is "one billion, two hundred twenty-three million, five hundred fifty-seven thousand, eight hundred eighty-nine".