1399052729 has 2 divisors, whose sum is σ = 1399052730. Its totient is φ = 1399052728.

The previous prime is 1399052651. The next prime is 1399052737. The reversal of 1399052729 is 9272509931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 909625600 + 489427129 = 30160^2 + 22123^2 .

It is an emirp because it is prime and its reverse (9272509931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1399052729 - 2¹⁶ = 1398987193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1399652729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699526364 + 699526365.

It is an arithmetic number, because the mean of its divisors is an integer number (699526365).

Almost surely, 2^1399052729 is an apocalyptic number.

It is an amenable number.

1399052729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399052729 is an equidigital number, since it uses as much as digits as its factorization.

1399052729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 1399052729 is about 37403.9132845749. The cubic root of 1399052729 is about 1118.4365752508.

The spelling of 1399052729 in words is "one billion, three hundred ninety-nine million, fifty-two thousand, seven hundred twenty-nine".