1218512939 has 12 divisors (see below), whose sum is σ = 1463179968. Its totient is φ = 1010746800.

The previous prime is 1218512917. The next prime is 1218512951. The reversal of 1218512939 is 9392158121.

It is not a de Polignac number, because 1218512939 - 2¹⁶ = 1218447403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1218512896 and 1218512905.

It is not an unprimeable number, because it can be changed into a prime (1218512539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 399572 + ... + 402609.

It is an arithmetic number, because the mean of its divisors is an integer number (121931664).

Almost surely, 2^1218512939 is an apocalyptic number.

1218512939 is a deficient number, since it is larger than the sum of its proper divisors (244667029).

1218512939 is an equidigital number, since it uses as much as digits as its factorization.

1218512939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802226 (or 802219 counting only the distinct ones).

The product of its digits is 38880, while the sum is 41.

The square root of 1218512939 is about 34907.2046861389. The cubic root of 1218512939 is about 1068.0954091309.

The spelling of 1218512939 in words is "one billion, two hundred eighteen million, five hundred twelve thousand, nine hundred thirty-nine".