1218820799 has 8 divisors (see below), whose sum is σ = 1393244160. Its totient is φ = 1044473976.

The previous prime is 1218820777. The next prime is 1218820819. The reversal of 1218820799 is 9970288121.

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

It is not a de Polignac number, because 1218820799 - 2⁸ = 1218820543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218820709) 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, 20462 + ... + 53444.

It is an arithmetic number, because the mean of its divisors is an integer number (174155520).

Almost surely, 2^1218820799 is an apocalyptic number.

1218820799 is a deficient number, since it is larger than the sum of its proper divisors (174423361).

1218820799 is an equidigital number, since it uses as much as digits as its factorization.

1218820799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38269.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 1218820799 is about 34911.6140990359. The cubic root of 1218820799 is about 1068.1853537821.

The spelling of 1218820799 in words is "one billion, two hundred eighteen million, eight hundred twenty thousand, seven hundred ninety-nine".