1216363520 has 44 divisors (see below), whose sum is σ = 2917859304. Its totient is φ = 486543360.

The previous prime is 1216363507. The next prime is 1216363541. The reversal of 1216363520 is 253636121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113666 + ... + 123905.

Almost surely, 2^1216363520 is an apocalyptic number.

1216363520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216363520 is an abundant number, since it is smaller than the sum of its proper divisors (1701495784).

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

1216363520 is an equidigital number, since it uses as much as digits as its factorization.

1216363520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237596 (or 237578 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 1216363520 is about 34876.4034843044. The cubic root of 1216363520 is about 1067.4670104451.

Adding to 1216363520 its reverse (253636121), we get a palindrome (1469999641).

The spelling of 1216363520 in words is "one billion, two hundred sixteen million, three hundred sixty-three thousand, five hundred twenty".