1212391218 has 32 divisors (see below), whose sum is σ = 2483592192. Its totient is φ = 394409600.

The previous prime is 1212391211. The next prime is 1212391241. The reversal of 1212391218 is 8121932121.

It is not an unprimeable number, because it can be changed into a prime (1212391211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50758 + ... + 70718.

It is an arithmetic number, because the mean of its divisors is an integer number (77612256).

Almost surely, 2^1212391218 is an apocalyptic number.

1212391218 is an abundant number, since it is smaller than the sum of its proper divisors (1271200974).

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

1212391218 is a wasteful number, since it uses less digits than its factorization.

1212391218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20210.

The product of its digits is 1728, while the sum is 30.

The square root of 1212391218 is about 34819.4086394356. The cubic root of 1212391218 is about 1066.3037272814.

The spelling of 1212391218 in words is "one billion, two hundred twelve million, three hundred ninety-one thousand, two hundred eighteen".