1223855616 has 40 divisors (see below), whose sum is σ = 3260431944. Its totient is φ = 407951360.

The previous prime is 1223855587. The next prime is 1223855629. The reversal of 1223855616 is 6165583221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396855 + ... + 399926.

Almost surely, 2^1223855616 is an apocalyptic number.

1223855616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1223855616 is an abundant number, since it is smaller than the sum of its proper divisors (2036576328).

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

1223855616 is an frugal number, since it uses more digits than its factorization.

1223855616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796802 (or 796786 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 1223855616 is about 34983.6478372396. The cubic root of 1223855616 is about 1069.6541858578.

The spelling of 1223855616 in words is "one billion, two hundred twenty-three million, eight hundred fifty-five thousand, six hundred sixteen".