1396165405 has 4 divisors (see below), whose sum is σ = 1675398492. Its totient is φ = 1116932320.

The previous prime is 1396165399. The next prime is 1396165417. The reversal of 1396165405 is 5045616931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5045616931 = 3643 ⋅1385017.

It can be written as a sum of positive squares in 2 ways, for example, as 839724484 + 556440921 = 28978^2 + 23589^2 .

It is not a de Polignac number, because 1396165405 - 2¹⁷ = 1396034333 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139616536 + ... + 139616545.

It is an arithmetic number, because the mean of its divisors is an integer number (418849623).

Almost surely, 2^1396165405 is an apocalyptic number.

It is an amenable number.

1396165405 is a deficient number, since it is larger than the sum of its proper divisors (279233087).

1396165405 is an equidigital number, since it uses as much as digits as its factorization.

1396165405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279233086.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 1396165405 is about 37365.2968006411. The cubic root of 1396165405 is about 1117.6666464855. Note that the first 4 decimals are identical.

The spelling of 1396165405 in words is "one billion, three hundred ninety-six million, one hundred sixty-five thousand, four hundred five".