1396681647 has 8 divisors (see below), whose sum is σ = 1943209344. Its totient is φ = 890637528.

The previous prime is 1396681619. The next prime is 1396681679. The reversal of 1396681647 is 7461866931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1396681647 - 2³⁰ = 322939823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1396681647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1396681547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10120813 + ... + 10120950.

It is an arithmetic number, because the mean of its divisors is an integer number (242901168).

Almost surely, 2^1396681647 is an apocalyptic number.

1396681647 is a deficient number, since it is larger than the sum of its proper divisors (546527697).

1396681647 is a wasteful number, since it uses less digits than its factorization.

1396681647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20241789.

The product of its digits is 1306368, while the sum is 51.

The square root of 1396681647 is about 37372.2042031240. The cubic root of 1396681647 is about 1117.8043845507.

The spelling of 1396681647 in words is "one billion, three hundred ninety-six million, six hundred eighty-one thousand, six hundred forty-seven".