1218780323 has 4 divisors (see below), whose sum is σ = 1221283440. Its totient is φ = 1216277208.

The previous prime is 1218780319. The next prime is 1218780349. The reversal of 1218780323 is 3230878121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3230878121 = 5237 ⋅616933.

It is a cyclic number.

It is not a de Polignac number, because 1218780323 - 2² = 1218780319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218780623) 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, 1250828 + ... + 1251801.

It is an arithmetic number, because the mean of its divisors is an integer number (305320860).

Almost surely, 2^1218780323 is an apocalyptic number.

1218780323 is a deficient number, since it is larger than the sum of its proper divisors (2503117).

1218780323 is an equidigital number, since it uses as much as digits as its factorization.

1218780323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503116.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 1218780323 is about 34911.0344017475. The cubic root of 1218780323 is about 1068.1735291428.

The spelling of 1218780323 in words is "one billion, two hundred eighteen million, seven hundred eighty thousand, three hundred twenty-three".