1218457208 has 16 divisors (see below), whose sum is σ = 2289384000. Its totient is φ = 607954816.

The previous prime is 1218457193. The next prime is 1218457241. The reversal of 1218457208 is 8027548121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155153 + ... + 162816.

It is an arithmetic number, because the mean of its divisors is an integer number (143086500).

Almost surely, 2^1218457208 is an apocalyptic number.

It is an amenable number.

1218457208 is a deficient number, since it is larger than the sum of its proper divisors (1070926792).

1218457208 is a wasteful number, since it uses less digits than its factorization.

1218457208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318454 (or 318450 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 38.

The square root of 1218457208 is about 34906.4064034097. The cubic root of 1218457208 is about 1068.0791250929.

The spelling of 1218457208 in words is "one billion, two hundred eighteen million, four hundred fifty-seven thousand, two hundred eight".