1223204042 has 4 divisors (see below), whose sum is σ = 1834806066. Its totient is φ = 611602020.

The previous prime is 1223204041. The next prime is 1223204057. The reversal of 1223204042 is 2404023221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2404023221 = 5857 ⋅410453.

It can be written as a sum of positive squares in only one way, i.e., 1024704121 + 198499921 = 32011^2 + 14089^2 .

It is not an unprimeable number, because it can be changed into a prime (1223204041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305801009 + ... + 305801012.

Almost surely, 2^1223204042 is an apocalyptic number.

1223204042 is a deficient number, since it is larger than the sum of its proper divisors (611602024).

1223204042 is an equidigital number, since it uses as much as digits as its factorization.

1223204042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611602023.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1223204042 is about 34974.3340465548. The cubic root of 1223204042 is about 1069.4643261582.

Adding to 1223204042 its reverse (2404023221), we get a palindrome (3627227263).

The spelling of 1223204042 in words is "one billion, two hundred twenty-three million, two hundred four thousand, forty-two".