2153806 has 4 divisors (see below), whose sum is σ = 3230712. Its totient is φ = 1076902.

The previous prime is 2153797. The next prime is 2153813. The reversal of 2153806 is 6083512.

It is a happy number.

2153806 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 is a congruent number.

It is an unprimeable number.

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, 538450 + ... + 538453.

It is an arithmetic number, because the mean of its divisors is an integer number (807678).

2^2153806 is an apocalyptic number.

2153806 is a deficient number, since it is larger than the sum of its proper divisors (1076906).

2153806 is a wasteful number, since it uses less digits than its factorization.

2153806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076905.

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

The square root of 2153806 is about 1467.5850912298. The cubic root of 2153806 is about 129.1424022869.

The spelling of 2153806 in words is "two million, one hundred fifty-three thousand, eight hundred six".