1223985749 has 6 divisors (see below), whose sum is σ = 1423820214. Its totient is φ = 1049130600.

The previous prime is 1223985727. The next prime is 1223985769. The reversal of 1223985749 is 9475893221.

It can be written as a sum of positive squares in only one way, i.e., 803325649 + 420660100 = 28343^2 + 20510^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1223985749 is a prime.

It is a super-2 number, since 2×1223985749² = 2996282227510182002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1223985697 and 1223985706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223985709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12489602 + ... + 12489699.

It is an arithmetic number, because the mean of its divisors is an integer number (237303369).

Almost surely, 2^1223985749 is an apocalyptic number.

It is an amenable number.

1223985749 is a deficient number, since it is larger than the sum of its proper divisors (199834465).

1223985749 is an equidigital number, since it uses as much as digits as its factorization.

1223985749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24979315 (or 24979308 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 50.

The square root of 1223985749 is about 34985.5076996176. The cubic root of 1223985749 is about 1069.6920967499.

The spelling of 1223985749 in words is "one billion, two hundred twenty-three million, nine hundred eighty-five thousand, seven hundred forty-nine".