1223240789 has 2 divisors, whose sum is σ = 1223240790. Its totient is φ = 1223240788.

The previous prime is 1223240771. The next prime is 1223240813. The reversal of 1223240789 is 9870423221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1222900900 + 339889 = 34970^2 + 583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223240789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223240989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611620394 + 611620395.

It is an arithmetic number, because the mean of its divisors is an integer number (611620395).

Almost surely, 2^1223240789 is an apocalyptic number.

It is an amenable number.

1223240789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223240789 is an equidigital number, since it uses as much as digits as its factorization.

1223240789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 1223240789 is about 34974.8593849925. The cubic root of 1223240789 is about 1069.4750355222.

The spelling of 1223240789 in words is "one billion, two hundred twenty-three million, two hundred forty thousand, seven hundred eighty-nine".