1218708939 has 36 divisors (see below), whose sum is σ = 1921838904. Its totient is φ = 684827136.

The previous prime is 1218708913. The next prime is 1218708941. The reversal of 1218708939 is 9398078121.

It is not a de Polignac number, because 1218708939 - 2²¹ = 1216611787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218708949) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3616179 + ... + 3616515.

It is an arithmetic number, because the mean of its divisors is an integer number (53384414).

Almost surely, 2^1218708939 is an apocalyptic number.

1218708939 is a deficient number, since it is larger than the sum of its proper divisors (703129965).

1218708939 is an frugal number, since it uses more digits than its factorization.

1218708939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 1218708939 is about 34910.0120166121. The cubic root of 1218708939 is about 1068.1526744171.

The spelling of 1218708939 in words is "one billion, two hundred eighteen million, seven hundred eight thousand, nine hundred thirty-nine".