1399986409 has 2 divisors, whose sum is σ = 1399986410. Its totient is φ = 1399986408.

The previous prime is 1399986391. The next prime is 1399986433. The reversal of 1399986409 is 9046899931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 973440000 + 426546409 = 31200^2 + 20653^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399986409 - 2¹¹ = 1399984361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1399986439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699993204 + 699993205.

It is an arithmetic number, because the mean of its divisors is an integer number (699993205).

Almost surely, 2^1399986409 is an apocalyptic number.

It is an amenable number.

1399986409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399986409 is an equidigital number, since it uses as much as digits as its factorization.

1399986409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3779136, while the sum is 58.

The square root of 1399986409 is about 37416.3922499217. The cubic root of 1399986409 is about 1118.6853220455.

The spelling of 1399986409 in words is "one billion, three hundred ninety-nine million, nine hundred eighty-six thousand, four hundred nine".