1218203841 has 16 divisors (see below), whose sum is σ = 1689010560. Its totient is φ = 780057600.

The previous prime is 1218203839. The next prime is 1218203851. The reversal of 1218203841 is 1483028121.

It is not a de Polignac number, because 1218203841 - 2¹ = 1218203839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1218203799 and 1218203808.

It is not an unprimeable number, because it can be changed into a prime (1218203821) 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 15 ways as a sum of consecutive naturals, for example, 19485 + ... + 53066.

It is an arithmetic number, because the mean of its divisors is an integer number (105563160).

Almost surely, 2^1218203841 is an apocalyptic number.

It is an amenable number.

1218203841 is a deficient number, since it is larger than the sum of its proper divisors (470806719).

1218203841 is a wasteful number, since it uses less digits than its factorization.

1218203841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72776.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 1218203841 is about 34902.7769812088. The cubic root of 1218203841 is about 1068.0050875419.

The spelling of 1218203841 in words is "one billion, two hundred eighteen million, two hundred three thousand, eight hundred forty-one".