1218938736 has 20 divisors (see below), whose sum is σ = 3148925192. Its totient is φ = 406312896.

The previous prime is 1218938729. The next prime is 1218938779. The reversal of 1218938736 is 6378398121.

It is a super-3 number, since 3×1218938736³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 25394557 = 1218938736 / (1 + 2 + 1 + 8 + 9 + 3 + 8 + 7 + 3 + 6).

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, 12697231 + ... + 12697326.

Almost surely, 2^1218938736 is an apocalyptic number.

1218938736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1218938736 is an abundant number, since it is smaller than the sum of its proper divisors (1929986456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218938736 is a wasteful number, since it uses less digits than its factorization.

1218938736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25394568 (or 25394562 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 1218938736 is about 34913.3031379158. The cubic root of 1218938736 is about 1068.2198063483.

The spelling of 1218938736 in words is "one billion, two hundred eighteen million, nine hundred thirty-eight thousand, seven hundred thirty-six".