1320240409 has 2 divisors, whose sum is σ = 1320240410. Its totient is φ = 1320240408.

The previous prime is 1320240371. The next prime is 1320240419. The reversal of 1320240409 is 9040420231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1317690000 + 2550409 = 36300^2 + 1597^2 .

It is an emirp because it is prime and its reverse (9040420231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320240409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320240419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660120204 + 660120205.

It is an arithmetic number, because the mean of its divisors is an integer number (660120205).

Almost surely, 2^1320240409 is an apocalyptic number.

It is an amenable number.

1320240409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320240409 is an equidigital number, since it uses as much as digits as its factorization.

1320240409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1320240409 is about 36335.1126185127. The cubic root of 1320240409 is about 1097.0279022449.

The spelling of 1320240409 in words is "one billion, three hundred twenty million, two hundred forty thousand, four hundred nine".