2159855 has 8 divisors (see below), whose sum is σ = 2603664. Its totient is φ = 1720000.

The previous prime is 2159831. The next prime is 2159881. The reversal of 2159855 is 5589512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2159855 - 2¹⁰ = 2158831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395 + ... + 2115.

It is an arithmetic number, because the mean of its divisors is an integer number (325458).

2^2159855 is an apocalyptic number.

2159855 is a deficient number, since it is larger than the sum of its proper divisors (443809).

2159855 is a wasteful number, since it uses less digits than its factorization.

2159855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977.

The product of its digits is 18000, while the sum is 35.

The square root of 2159855 is about 1469.6445148402. The cubic root of 2159855 is about 129.2631888091.

The spelling of 2159855 in words is "two million, one hundred fifty-nine thousand, eight hundred fifty-five".