1309396447 has 2 divisors, whose sum is σ = 1309396448. Its totient is φ = 1309396446.

The previous prime is 1309396373. The next prime is 1309396471. The reversal of 1309396447 is 7446939031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1309396447 - 2²³ = 1301007839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1309396397 and 1309396406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1309396247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654698223 + 654698224.

It is an arithmetic number, because the mean of its divisors is an integer number (654698224).

Almost surely, 2^1309396447 is an apocalyptic number.

1309396447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309396447 is an equidigital number, since it uses as much as digits as its factorization.

1309396447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 46.

The square root of 1309396447 is about 36185.5834138404. The cubic root of 1309396447 is about 1094.0161153095.

The spelling of 1309396447 in words is "one billion, three hundred nine million, three hundred ninety-six thousand, four hundred forty-seven".