1394808240409 has 2 divisors, whose sum is σ = 1394808240410. Its totient is φ = 1394808240408.

The previous prime is 1394808240359. The next prime is 1394808240451. The reversal of 1394808240409 is 9040428084931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1394808240400 + 9 = 1181020^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 1394808240409 - 2⁹ = 1394808239897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1394808244409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 697404120204 + 697404120205.

It is an arithmetic number, because the mean of its divisors is an integer number (697404120205).

Almost surely, 2^{1394808240409} is an apocalyptic number.

It is an amenable number.

1394808240409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1394808240409 is an equidigital number, since it uses as much as digits as its factorization.

1394808240409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1990656, while the sum is 52.

The spelling of 1394808240409 in words is "one trillion, three hundred ninety-four billion, eight hundred eight million, two hundred forty thousand, four hundred nine".