1218514340 has 24 divisors (see below), whose sum is σ = 2628040632. Its totient is φ = 474232320.

The previous prime is 1218514333. The next prime is 1218514343. The reversal of 1218514340 is 434158121.

It can be written as a sum of positive squares in 4 ways, for example, as 356152384 + 862361956 = 18872^2 + 29366^2 .

It is not an unprimeable number, because it can be changed into a prime (1218514343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 822581 + ... + 824060.

It is an arithmetic number, because the mean of its divisors is an integer number (109501693).

Almost surely, 2^1218514340 is an apocalyptic number.

1218514340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218514340 is an abundant number, since it is smaller than the sum of its proper divisors (1409526292).

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

1218514340 is a wasteful number, since it uses less digits than its factorization.

1218514340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646687 (or 1646685 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 1218514340 is about 34907.2247536237. The cubic root of 1218514340 is about 1068.0958184826.

The spelling of 1218514340 in words is "one billion, two hundred eighteen million, five hundred fourteen thousand, three hundred forty".