1218776345 has 8 divisors (see below), whose sum is σ = 1467236160. Its totient is φ = 971884720.

The previous prime is 1218776341. The next prime is 1218776353. The reversal of 1218776345 is 5436778121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1218776345 - 2² = 1218776341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1218776296 and 1218776305.

It is not an unprimeable number, because it can be changed into a prime (1218776341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390335 + ... + 393444.

It is an arithmetic number, because the mean of its divisors is an integer number (183404520).

Almost surely, 2^1218776345 is an apocalyptic number.

It is an amenable number.

1218776345 is a deficient number, since it is larger than the sum of its proper divisors (248459815).

1218776345 is an equidigital number, since it uses as much as digits as its factorization.

1218776345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784095.

The product of its digits is 282240, while the sum is 44.

The square root of 1218776345 is about 34910.9774283104. The cubic root of 1218776345 is about 1068.1723669976.

It can be divided in two parts, 1218776 and 345, that added together give a palindrome (1219121).

The spelling of 1218776345 in words is "one billion, two hundred eighteen million, seven hundred seventy-six thousand, three hundred forty-five".