2156393 has 2 divisors, whose sum is σ = 2156394. Its totient is φ = 2156392.

The previous prime is 2156387. The next prime is 2156417. The reversal of 2156393 is 3936512.

2156393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2155024 + 1369 = 1468^2 + 37^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156393 - 2⁴ = 2156377 is a prime.

It is a Sophie Germain prime.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 5³ + 6² + 3 + 9⁵ + 3³ .

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2156303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078196 + 1078197.

It is an arithmetic number, because the mean of its divisors is an integer number (1078197).

2^2156393 is an apocalyptic number.

It is an amenable number.

2156393 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156393 is an equidigital number, since it uses as much as digits as its factorization.

2156393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 29.

The square root of 2156393 is about 1468.4662066251. The cubic root of 2156393 is about 129.1940871835.

The spelling of 2156393 in words is "two million, one hundred fifty-six thousand, three hundred ninety-three".