1218548387 has 16 divisors (see below), whose sum is σ = 1431967680. Its totient is φ = 1015327872.

The previous prime is 1218548347. The next prime is 1218548447. The reversal of 1218548387 is 7838458121.

It is a cyclic number.

It is not a de Polignac number, because 1218548387 - 2⁶ = 1218548323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218548327) 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, 25373 + ... + 55505.

It is an arithmetic number, because the mean of its divisors is an integer number (89497980).

Almost surely, 2^1218548387 is an apocalyptic number.

1218548387 is a deficient number, since it is larger than the sum of its proper divisors (213419293).

1218548387 is a wasteful number, since it uses less digits than its factorization.

1218548387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30302.

The product of its digits is 430080, while the sum is 47.

The square root of 1218548387 is about 34907.7124286310. The cubic root of 1218548387 is about 1068.1057664218.

The spelling of 1218548387 in words is "one billion, two hundred eighteen million, five hundred forty-eight thousand, three hundred eighty-seven".