1218698086 has 4 divisors (see below), whose sum is σ = 1828047132. Its totient is φ = 609349042.

The previous prime is 1218698083. The next prime is 1218698087. The reversal of 1218698086 is 6808968121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6808968121 = 37369 ⋅182209.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218698081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304674520 + ... + 304674523.

It is an arithmetic number, because the mean of its divisors is an integer number (457011783).

Almost surely, 2^1218698086 is an apocalyptic number.

1218698086 is a deficient number, since it is larger than the sum of its proper divisors (609349046).

1218698086 is an equidigital number, since it uses as much as digits as its factorization.

1218698086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609349045.

The product of its (nonzero) digits is 331776, while the sum is 49.

The square root of 1218698086 is about 34909.8565737529. The cubic root of 1218698086 is about 1068.1495036585.

The spelling of 1218698086 in words is "one billion, two hundred eighteen million, six hundred ninety-eight thousand, eighty-six".