1218931912 has 32 divisors (see below), whose sum is σ = 2495304000. Its totient is φ = 553608000.

The previous prime is 1218931907. The next prime is 1218931919. The reversal of 1218931912 is 2191398121.

It is not an unprimeable number, because it can be changed into a prime (1218931919) 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, 118162 + ... + 128062.

It is an arithmetic number, because the mean of its divisors is an integer number (77978250).

Almost surely, 2^1218931912 is an apocalyptic number.

It is an amenable number.

1218931912 is an abundant number, since it is smaller than the sum of its proper divisors (1276372088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218931912 is a wasteful number, since it uses less digits than its factorization.

1218931912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11317 (or 11313 counting only the distinct ones).

The product of its digits is 7776, while the sum is 37.

The square root of 1218931912 is about 34913.2054099878. The cubic root of 1218931912 is about 1068.2178129351.

The spelling of 1218931912 in words is "one billion, two hundred eighteen million, nine hundred thirty-one thousand, nine hundred twelve".