1218078634 has 4 divisors (see below), whose sum is σ = 1827117954. Its totient is φ = 609039316.

The previous prime is 1218078607. The next prime is 1218078637. The reversal of 1218078634 is 4368708121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4368708121 = 4201 ⋅1039921.

It can be written as a sum of positive squares in only one way, i.e., 684607225 + 533471409 = 26165^2 + 23097^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1218078637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304519657 + ... + 304519660.

Almost surely, 2^1218078634 is an apocalyptic number.

1218078634 is a deficient number, since it is larger than the sum of its proper divisors (609039320).

1218078634 is an equidigital number, since it uses as much as digits as its factorization.

1218078634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609039319.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1218078634 is about 34900.9832812773. The cubic root of 1218078634 is about 1067.9684964312.

The spelling of 1218078634 in words is "one billion, two hundred eighteen million, seventy-eight thousand, six hundred thirty-four".