2158306 has 4 divisors (see below), whose sum is σ = 3237462. Its totient is φ = 1079152.

The previous prime is 2158301. The next prime is 2158307. The reversal of 2158306 is 6038512.

It is a happy number.

2158306 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 1809025 + 349281 = 1345^2 + 591^2 .

It is not an unprimeable number, because it can be changed into a prime (2158301) 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, 539575 + ... + 539578.

2^2158306 is an apocalyptic number.

2158306 is a deficient number, since it is larger than the sum of its proper divisors (1079156).

2158306 is a wasteful number, since it uses less digits than its factorization.

2158306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079155.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2158306 is about 1469.1174221280. The cubic root of 2158306 is about 129.2322798569.

The spelling of 2158306 in words is "two million, one hundred fifty-eight thousand, three hundred six".