1396843817 has 4 divisors (see below), whose sum is σ = 1397306196. Its totient is φ = 1396381440.

The previous prime is 1396843757. The next prime is 1396843823. The reversal of 1396843817 is 7183486931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1085109481 + 311734336 = 32941^2 + 17656^2 .

It is a cyclic number.

It is not a de Polignac number, because 1396843817 - 2¹² = 1396839721 is a prime.

It is a super-2 number, since 2×1396843817² = 3902345298182258978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1396843517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226628 + ... + 232709.

It is an arithmetic number, because the mean of its divisors is an integer number (349326549).

Almost surely, 2^1396843817 is an apocalyptic number.

It is an amenable number.

1396843817 is a deficient number, since it is larger than the sum of its proper divisors (462379).

1396843817 is an equidigital number, since it uses as much as digits as its factorization.

1396843817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462378.

The product of its digits is 870912, while the sum is 50.

The square root of 1396843817 is about 37374.3738007742. The cubic root of 1396843817 is about 1117.8476459772.

The spelling of 1396843817 in words is "one billion, three hundred ninety-six million, eight hundred forty-three thousand, eight hundred seventeen".