1218420136 has 16 divisors (see below), whose sum is σ = 2337667200. Its totient is φ = 595042224.

The previous prime is 1218420121. The next prime is 1218420139. The reversal of 1218420136 is 6310248121.

It is not an unprimeable number, because it can be changed into a prime (1218420139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1770616 + ... + 1771303.

It is an arithmetic number, because the mean of its divisors is an integer number (146104200).

Almost surely, 2^1218420136 is an apocalyptic number.

It is an amenable number.

1218420136 is a deficient number, since it is larger than the sum of its proper divisors (1119247064).

1218420136 is a wasteful number, since it uses less digits than its factorization.

1218420136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3541968 (or 3541964 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1218420136 is about 34905.8753793684. The cubic root of 1218420136 is about 1068.0682927522.

Adding to 1218420136 its reverse (6310248121), we get a palindrome (7528668257).

The spelling of 1218420136 in words is "one billion, two hundred eighteen million, four hundred twenty thousand, one hundred thirty-six".