1216623239 has 4 divisors (see below), whose sum is σ = 1310209656. Its totient is φ = 1123036824.

The previous prime is 1216623227. The next prime is 1216623259. The reversal of 1216623239 is 9323266121.

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

It is a de Polignac number, because none of the positive numbers 2^k-1216623239 is a prime.

It is a super-2 number, since 2×1216623239² = 2960344211349702242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1216623199 and 1216623208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216623259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46793189 + ... + 46793214.

It is an arithmetic number, because the mean of its divisors is an integer number (327552414).

Almost surely, 2^1216623239 is an apocalyptic number.

1216623239 is a deficient number, since it is larger than the sum of its proper divisors (93586417).

1216623239 is an equidigital number, since it uses as much as digits as its factorization.

1216623239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93586416.

The product of its digits is 23328, while the sum is 35.

The square root of 1216623239 is about 34880.1267056185. The cubic root of 1216623239 is about 1067.5429805341.

The spelling of 1216623239 in words is "one billion, two hundred sixteen million, six hundred twenty-three thousand, two hundred thirty-nine".