1243220002 has 4 divisors (see below), whose sum is σ = 1864830006. Its totient is φ = 621610000.

The previous prime is 1243219987. The next prime is 1243220021. The reversal of 1243220002 is 2000223421.

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

It can be written as a sum of positive squares in only one way, i.e., 1147786641 + 95433361 = 33879^2 + 9769^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310804999 + ... + 310805002.

Almost surely, 2^1243220002 is an apocalyptic number.

1243220002 is a deficient number, since it is larger than the sum of its proper divisors (621610004).

1243220002 is an equidigital number, since it uses as much as digits as its factorization.

1243220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621610003.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 1243220002 is about 35259.3250360809. The cubic root of 1243220002 is about 1075.2662047065.

Adding to 1243220002 its reverse (2000223421), we get a palindrome (3243443423).

The spelling of 1243220002 in words is "one billion, two hundred forty-three million, two hundred twenty thousand, two".