1218813788 has 6 divisors (see below), whose sum is σ = 2132924136. Its totient is φ = 609406892.

The previous prime is 1218813773. The next prime is 1218813803. The reversal of 1218813788 is 8873188121.

It is an interprime number because it is at equal distance from previous prime (1218813773) and next prime (1218813803).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152351720 + ... + 152351727.

It is an arithmetic number, because the mean of its divisors is an integer number (355487356).

Almost surely, 2^1218813788 is an apocalyptic number.

It is an amenable number.

1218813788 is a deficient number, since it is larger than the sum of its proper divisors (914110348).

1218813788 is a wasteful number, since it uses less digits than its factorization.

1218813788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304703451 (or 304703449 counting only the distinct ones).

The product of its digits is 172032, while the sum is 47.

The square root of 1218813788 is about 34911.5136881803. The cubic root of 1218813788 is about 1068.1833056106.

The spelling of 1218813788 in words is "one billion, two hundred eighteen million, eight hundred thirteen thousand, seven hundred eighty-eight".