1218417912 has 24 divisors (see below), whose sum is σ = 3299882040. Its totient is φ = 406139280.

The previous prime is 1218417899. The next prime is 1218417913. The reversal of 1218417912 is 2197148121.

1218417912 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218417913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8461164 + ... + 8461307.

It is an arithmetic number, because the mean of its divisors is an integer number (137495085).

Almost surely, 2^1218417912 is an apocalyptic number.

1218417912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1218417912 is an abundant number, since it is smaller than the sum of its proper divisors (2081464128).

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

1218417912 is a wasteful number, since it uses less digits than its factorization.

1218417912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16922483 (or 16922476 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1218417912 is about 34905.8435222528. The cubic root of 1218417912 is about 1068.0676428983.

The spelling of 1218417912 in words is "one billion, two hundred eighteen million, four hundred seventeen thousand, nine hundred twelve".