1223516440 has 16 divisors (see below), whose sum is σ = 2752912080. Its totient is φ = 489406560.

The previous prime is 1223516423. The next prime is 1223516447. The reversal of 1223516440 is 446153221.

It is a junction number, because it is equal to n+sod(n) for n = 1223516399 and 1223516408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223516447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15293916 + ... + 15293995.

It is an arithmetic number, because the mean of its divisors is an integer number (172057005).

Almost surely, 2^1223516440 is an apocalyptic number.

1223516440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223516440 is an abundant number, since it is smaller than the sum of its proper divisors (1529395640).

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

1223516440 is a wasteful number, since it uses less digits than its factorization.

1223516440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30587922 (or 30587918 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1223516440 is about 34978.7998650611. The cubic root of 1223516440 is about 1069.5553630490. Note that the first 3 decimals are identical.

Adding to 1223516440 its reverse (446153221), we get a palindrome (1669669661).

The spelling of 1223516440 in words is "one billion, two hundred twenty-three million, five hundred sixteen thousand, four hundred forty".