1212040243 has 16 divisors (see below), whose sum is σ = 1246875136. Its totient is φ = 1177830720.

The previous prime is 1212040241. The next prime is 1212040261. The reversal of 1212040243 is 3420402121.

It is a cyclic number.

It is not a de Polignac number, because 1212040243 - 2¹ = 1212040241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212040243.

It is not an unprimeable number, because it can be changed into a prime (1212040241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2488546 + ... + 2489032.

It is an arithmetic number, because the mean of its divisors is an integer number (77929696).

Almost surely, 2^1212040243 is an apocalyptic number.

1212040243 is a deficient number, since it is larger than the sum of its proper divisors (34834893).

1212040243 is a wasteful number, since it uses less digits than its factorization.

1212040243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1212040243 is about 34814.3683412467. The cubic root of 1212040243 is about 1066.2008226346.

Adding to 1212040243 its reverse (3420402121), we get a palindrome (4632442364).

The spelling of 1212040243 in words is "one billion, two hundred twelve million, forty thousand, two hundred forty-three".