1243116939 has 4 divisors (see below), whose sum is σ = 1657489256. Its totient is φ = 828744624.

The previous prime is 1243116913. The next prime is 1243116947. The reversal of 1243116939 is 9396113421.

It is a happy number.

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

It is not a de Polignac number, because 1243116939 - 2⁸ = 1243116683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1243116897 and 1243116906.

It is not an unprimeable number, because it can be changed into a prime (1243116139) 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, 207186154 + ... + 207186159.

It is an arithmetic number, because the mean of its divisors is an integer number (414372314).

Almost surely, 2^1243116939 is an apocalyptic number.

1243116939 is a deficient number, since it is larger than the sum of its proper divisors (414372317).

1243116939 is an equidigital number, since it uses as much as digits as its factorization.

1243116939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414372316.

The product of its digits is 34992, while the sum is 39.

The square root of 1243116939 is about 35257.8635058904. The cubic root of 1243116939 is about 1075.2364906781.

The spelling of 1243116939 in words is "one billion, two hundred forty-three million, one hundred sixteen thousand, nine hundred thirty-nine".