1394635816809 has 9 divisors (see below), whose sum is σ = 2014479075063. Its totient is φ = 929754849312.

The previous prime is 1394635816799. The next prime is 1394635816817. The reversal of 1394635816809 is 9086185364931.

The square root of 1394635816809 is 1180947.

It is a perfect power (a square), and thus also a powerful number.

1394635816809 is a `hidden beast` number, since 1 + 3 + 9 + 46 + 3 + 581 + 6 + 8 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3745807209 + 1390890009600 = 61203^2 + 1179360^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1394635816809 - 2¹⁹ = 1394635292521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1394635812809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3346017 + ... + 3739665.

Almost surely, 2^{1394635816809} is an apocalyptic number.

1394635816809 is the 1180947-th square number.

1394635816809 is the 590474-th centered octagonal number.

It is an amenable number.

1394635816809 is a deficient number, since it is larger than the sum of its proper divisors (619843258254).

1394635816809 is an frugal number, since it uses more digits than its factorization.

1394635816809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787304 (or 393652 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 63.

The spelling of 1394635816809 in words is "one trillion, three hundred ninety-four billion, six hundred thirty-five million, eight hundred sixteen thousand, eight hundred nine".