2169855 has 16 divisors (see below), whose sum is σ = 3857760. Its totient is φ = 1157184.

The previous prime is 2169841. The next prime is 2169859. The reversal of 2169855 is 5589612.

It is a happy number.

It is not a de Polignac number, because 2169855 - 2¹⁴ = 2153471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2169859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7902 + ... + 8171.

It is an arithmetic number, because the mean of its divisors is an integer number (241110).

2^2169855 is an apocalyptic number.

2169855 is a deficient number, since it is larger than the sum of its proper divisors (1687905).

2169855 is a wasteful number, since it uses less digits than its factorization.

2169855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16087 (or 16081 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 2169855 is about 1473.0427692365. The cubic root of 2169855 is about 129.4623753390.

The spelling of 2169855 in words is "two million, one hundred sixty-nine thousand, eight hundred fifty-five".