1218240286 has 4 divisors (see below), whose sum is σ = 1827360432. Its totient is φ = 609120142.

The previous prime is 1218240253. The next prime is 1218240307. The reversal of 1218240286 is 6820428121.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304560070 + ... + 304560073.

It is an arithmetic number, because the mean of its divisors is an integer number (456840108).

Almost surely, 2^1218240286 is an apocalyptic number.

1218240286 is a deficient number, since it is larger than the sum of its proper divisors (609120146).

1218240286 is an equidigital number, since it uses as much as digits as its factorization.

1218240286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609120145.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 1218240286 is about 34903.2990704317. The cubic root of 1218240286 is about 1068.0157379371.

The spelling of 1218240286 in words is "one billion, two hundred eighteen million, two hundred forty thousand, two hundred eighty-six".