1218258336 has 96 divisors (see below), whose sum is σ = 3324174336. Its totient is φ = 390240000.

The previous prime is 1218258281. The next prime is 1218258341. The reversal of 1218258336 is 6338528121.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 1218258294 and 1218258303.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448021 + ... + 450731.

It is an arithmetic number, because the mean of its divisors is an integer number (34626816).

Almost surely, 2^1218258336 is an apocalyptic number.

1218258336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218258336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1662087168).

1218258336 is an abundant number, since it is smaller than the sum of its proper divisors (2105916000).

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

1218258336 is a wasteful number, since it uses less digits than its factorization.

1218258336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906 (or 2898 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 1218258336 is about 34903.5576410199. The cubic root of 1218258336 is about 1068.0210126461.

The spelling of 1218258336 in words is "one billion, two hundred eighteen million, two hundred fifty-eight thousand, three hundred thirty-six".