1396634694849 has 9 divisors (see below), whose sum is σ = 2017366347009. Its totient is φ = 931087432980.

The previous prime is 1396634694817. The next prime is 1396634694859. The reversal of 1396634694849 is 9484964366931.

The square root of 1396634694849 is 1181793.

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

1396634694849 is a `hidden beast` number, since 13 + 96 + 6 + 3 + 46 + 9 + 484 + 9 = 666.

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

It is not a de Polignac number, because 1396634694849 - 2⁵ = 1396634694817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1396634694859) 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 in 8 ways as a sum of consecutive naturals, for example, 3348414 + ... + 3742344.

Almost surely, 2^{1396634694849} is an apocalyptic number.

1396634694849 is the 1181793-rd square number.

1396634694849 is the 590897-th centered octagonal number.

It is an amenable number.

1396634694849 is a deficient number, since it is larger than the sum of its proper divisors (620731652160).

1396634694849 is an frugal number, since it uses more digits than its factorization.

1396634694849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787868 (or 393934 counting only the distinct ones).

The product of its digits is 725594112, while the sum is 72.

The spelling of 1396634694849 in words is "one trillion, three hundred ninety-six billion, six hundred thirty-four million, six hundred ninety-four thousand, eight hundred forty-nine".