2159806 has 16 divisors (see below), whose sum is σ = 3720960. Its totient is φ = 929880.

The previous prime is 2159789. The next prime is 2159809. The reversal of 2159806 is 6089512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2166 + ... + 3001.

It is an arithmetic number, because the mean of its divisors is an integer number (232560).

2^2159806 is an apocalyptic number.

2159806 is a deficient number, since it is larger than the sum of its proper divisors (1561154).

2159806 is a wasteful number, since it uses less digits than its factorization.

2159806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5199.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2159806 is about 1469.6278440476. The cubic root of 2159806 is about 129.2622112830.

The spelling of 2159806 in words is "two million, one hundred fifty-nine thousand, eight hundred six".