1200420243 has 36 divisors (see below), whose sum is σ = 1964342328. Its totient is φ = 727483680.

The previous prime is 1200420241. The next prime is 1200420257. The reversal of 1200420243 is 3420240021.

1200420243 is a `hidden beast` number, since 1 + 2 + 0 + 0 + 420 + 243 = 666.

It is not a de Polignac number, because 1200420243 - 2¹ = 1200420241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200420241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 63855 + ... + 80487.

Almost surely, 2^1200420243 is an apocalyptic number.

1200420243 is a deficient number, since it is larger than the sum of its proper divisors (763922085).

1200420243 is an frugal number, since it uses more digits than its factorization.

1200420243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16668 (or 16647 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1200420243 is about 34647.0813056454. The cubic root of 1200420243 is about 1062.7826032672.

Adding to 1200420243 its reverse (3420240021), we get a palindrome (4620660264).

The spelling of 1200420243 in words is "one billion, two hundred million, four hundred twenty thousand, two hundred forty-three".