1394039809 has 2 divisors, whose sum is σ = 1394039810. Its totient is φ = 1394039808.

The previous prime is 1394039789. The next prime is 1394039813. The reversal of 1394039809 is 9089304931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1365524209 + 28515600 = 36953^2 + 5340^2 .

It is a cyclic number.

It is not a de Polignac number, because 1394039809 - 2²⁵ = 1360485377 is a prime.

It is a super-3 number, since 3×1394039809³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1394039839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 697019904 + 697019905.

It is an arithmetic number, because the mean of its divisors is an integer number (697019905).

Almost surely, 2^1394039809 is an apocalyptic number.

It is an amenable number.

1394039809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1394039809 is an equidigital number, since it uses as much as digits as its factorization.

1394039809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 1394039809 is about 37336.8425151351. The cubic root of 1394039809 is about 1117.0991601405.

The spelling of 1394039809 in words is "one billion, three hundred ninety-four million, thirty-nine thousand, eight hundred nine".