1218207340 has 48 divisors (see below), whose sum is σ = 2928244032. Its totient is φ = 417021696.

The previous prime is 1218207323. The next prime is 1218207343. The reversal of 1218207340 is 437028121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1218207299 and 1218207308.

It is not an unprimeable number, because it can be changed into a prime (1218207343) 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, 88354 + ... + 101206.

It is an arithmetic number, because the mean of its divisors is an integer number (61005084).

Almost surely, 2^1218207340 is an apocalyptic number.

1218207340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218207340 is an abundant number, since it is smaller than the sum of its proper divisors (1710036692).

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

1218207340 is a wasteful number, since it uses less digits than its factorization.

1218207340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13546 (or 13544 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1218207340 is about 34902.8271061242. The cubic root of 1218207340 is about 1068.0061100709.

The spelling of 1218207340 in words is "one billion, two hundred eighteen million, two hundred seven thousand, three hundred forty".