1218920336 has 20 divisors (see below), whose sum is σ = 2362790364. Its totient is φ = 609168000.

The previous prime is 1218920323. The next prime is 1218920363. The reversal of 1218920336 is 6330298121.

It can be written as a sum of positive squares in 2 ways, for example, as 426835600 + 792084736 = 20660^2 + 28144^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1218920296 and 1218920305.

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, 18386 + ... + 52686.

Almost surely, 2^1218920336 is an apocalyptic number.

1218920336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1218920336 is a deficient number, since it is larger than the sum of its proper divisors (1143870028).

1218920336 is a wasteful number, since it uses less digits than its factorization.

1218920336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36530 (or 36524 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 1218920336 is about 34913.0396270505. The cubic root of 1218920336 is about 1068.2144313603.

The spelling of 1218920336 in words is "one billion, two hundred eighteen million, nine hundred twenty thousand, three hundred thirty-six".