1242772243 has 4 divisors (see below), whose sum is σ = 1276360720. Its totient is φ = 1209183768.

The previous prime is 1242772231. The next prime is 1242772253. The reversal of 1242772243 is 3422772421.

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

It is a cyclic number.

It is not a de Polignac number, because 1242772243 - 2⁵ = 1242772211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242772199 and 1242772208.

It is not an unprimeable number, because it can be changed into a prime (1242772253) 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 3 ways as a sum of consecutive naturals, for example, 16794183 + ... + 16794256.

It is an arithmetic number, because the mean of its divisors is an integer number (319090180).

Almost surely, 2^1242772243 is an apocalyptic number.

1242772243 is a deficient number, since it is larger than the sum of its proper divisors (33588477).

1242772243 is an equidigital number, since it uses as much as digits as its factorization.

1242772243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33588476.

The product of its digits is 37632, while the sum is 34.

The square root of 1242772243 is about 35252.9749524774. The cubic root of 1242772243 is about 1075.1370996587.

The spelling of 1242772243 in words is "one billion, two hundred forty-two million, seven hundred seventy-two thousand, two hundred forty-three".