1243203012 has 24 divisors (see below), whose sum is σ = 3223119200. Its totient is φ = 414400968.

The previous prime is 1243203011. The next prime is 1243203019. The reversal of 1243203012 is 2103023421.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1243203011) 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 7 ways as a sum of consecutive naturals, for example, 5755462 + ... + 5755677.

Almost surely, 2^1243203012 is an apocalyptic number.

1243203012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1243203012 is an abundant number, since it is smaller than the sum of its proper divisors (1979916188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243203012 is a wasteful number, since it uses less digits than its factorization.

1243203012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11511152 (or 11511144 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1243203012 is about 35259.0841060853. The cubic root of 1243203012 is about 1075.2613064433.

Adding to 1243203012 its reverse (2103023421), we get a palindrome (3346226433).

The spelling of 1243203012 in words is "one billion, two hundred forty-three million, two hundred three thousand, twelve".