1288393 has 2 divisors, whose sum is σ = 1288394. Its totient is φ = 1288392.

The previous prime is 1288367. The next prime is 1288421. The reversal of 1288393 is 3938821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 788544 + 499849 = 888^2 + 707^2 .

It is an emirp because it is prime and its reverse (3938821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1288393 - 2⁵ = 1288361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1288363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644196 + 644197.

It is an arithmetic number, because the mean of its divisors is an integer number (644197).

2^1288393 is an apocalyptic number.

It is an amenable number.

1288393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288393 is an equidigital number, since it uses as much as digits as its factorization.

1288393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 1288393 is about 1135.0740063978. The cubic root of 1288393 is about 108.8135014693.

It can be divided in two parts, 1288 and 393, that added together give a square (1681 = 41²).

The spelling of 1288393 in words is "one million, two hundred eighty-eight thousand, three hundred ninety-three".