1393996385 has 4 divisors (see below), whose sum is σ = 1672795668. Its totient is φ = 1115197104.

The previous prime is 1393996343. The next prime is 1393996399. The reversal of 1393996385 is 5836993931.

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 323856016 + 1070140369 = 17996^2 + 32713^2 .

It is a cyclic number.

It is not a de Polignac number, because 1393996385 - 2²⁴ = 1377219169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1393996385.

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, 139399634 + ... + 139399643.

It is an arithmetic number, because the mean of its divisors is an integer number (418198917).

Almost surely, 2^1393996385 is an apocalyptic number.

It is an amenable number.

1393996385 is a deficient number, since it is larger than the sum of its proper divisors (278799283).

1393996385 is an equidigital number, since it uses as much as digits as its factorization.

1393996385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278799282.

The product of its digits is 4723920, while the sum is 56.

The square root of 1393996385 is about 37336.2609938381. The cubic root of 1393996385 is about 1117.0875608979.

The spelling of 1393996385 in words is "one billion, three hundred ninety-three million, nine hundred ninety-six thousand, three hundred eighty-five".