1223312320 has 28 divisors (see below), whose sum is σ = 2913013224. Its totient is φ = 489324800.

The previous prime is 1223312257. The next prime is 1223312329. The reversal of 1223312320 is 232133221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223312329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1911106 + ... + 1911745.

Almost surely, 2^1223312320 is an apocalyptic number.

1223312320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223312320 is an abundant number, since it is smaller than the sum of its proper divisors (1689700904).

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

1223312320 is an equidigital number, since it uses as much as digits as its factorization.

1223312320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822868 (or 3822858 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1223312320 is about 34975.8819760131. The cubic root of 1223312320 is about 1069.4958815482.

Adding to 1223312320 its reverse (232133221), we get a palindrome (1455445541).

The spelling of 1223312320 in words is "one billion, two hundred twenty-three million, three hundred twelve thousand, three hundred twenty".