2129855 has 32 divisors (see below), whose sum is σ = 3268608. Its totient is φ = 1296000.

The previous prime is 2129851. The next prime is 2129861. The reversal of 2129855 is 5589212.

It is not a de Polignac number, because 2129855 - 2² = 2129851 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14030 + ... + 14180.

It is an arithmetic number, because the mean of its divisors is an integer number (102144).

2^2129855 is an apocalyptic number.

2129855 is a deficient number, since it is larger than the sum of its proper divisors (1138753).

2129855 is a wasteful number, since it uses less digits than its factorization.

2129855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207.

The product of its digits is 7200, while the sum is 32.

The square root of 2129855 is about 1459.4022749057. The cubic root of 2129855 is about 128.6619154315.

The spelling of 2129855 in words is "two million, one hundred twenty-nine thousand, eight hundred fifty-five".