2155605 has 16 divisors (see below), whose sum is σ = 3478464. Its totient is φ = 1139840.

The previous prime is 2155603. The next prime is 2155609. The reversal of 2155605 is 5065512.

It is not a de Polignac number, because 2155605 - 2¹ = 2155603 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155603) 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, 1417 + ... + 2513.

It is an arithmetic number, because the mean of its divisors is an integer number (217404).

2^2155605 is an apocalyptic number.

It is an amenable number.

2155605 is a deficient number, since it is larger than the sum of its proper divisors (1322859).

2155605 is a wasteful number, since it uses less digits than its factorization.

2155605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 2155605 is about 1468.1978749474. The cubic root of 2155605 is about 129.1783483480.

The spelling of 2155605 in words is "two million, one hundred fifty-five thousand, six hundred five".