1212040443 has 4 divisors (see below), whose sum is σ = 1616053928. Its totient is φ = 808026960.

The previous prime is 1212040429. The next prime is 1212040447. The reversal of 1212040443 is 3440402121.

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

It is not a de Polignac number, because 1212040443 - 2²¹ = 1209943291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212040447) 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, 202006738 + ... + 202006743.

It is an arithmetic number, because the mean of its divisors is an integer number (404013482).

Almost surely, 2^1212040443 is an apocalyptic number.

1212040443 is a deficient number, since it is larger than the sum of its proper divisors (404013485).

1212040443 is an equidigital number, since it uses as much as digits as its factorization.

1212040443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404013484.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1212040443 is about 34814.3712136238. The cubic root of 1212040443 is about 1066.2008812796.

Adding to 1212040443 its reverse (3440402121), we get a palindrome (4652442564).

The spelling of 1212040443 in words is "one billion, two hundred twelve million, forty thousand, four hundred forty-three".