2155845 has 16 divisors (see below), whose sum is σ = 3485952. Its totient is φ = 1137600.

The previous prime is 2155841. The next prime is 2155849. The reversal of 2155845 is 5485512.

It is an interprime number because it is at equal distance from previous prime (2155841) and next prime (2155849).

It is not a de Polignac number, because 2155845 - 2² = 2155841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155841) 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, 804 + ... + 2226.

It is an arithmetic number, because the mean of its divisors is an integer number (217872).

2^2155845 is an apocalyptic number.

It is an amenable number.

2155845 is a deficient number, since it is larger than the sum of its proper divisors (1330107).

2155845 is a wasteful number, since it uses less digits than its factorization.

2155845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532.

The product of its digits is 8000, while the sum is 30.

The square root of 2155845 is about 1468.2796055248. The cubic root of 2155845 is about 129.1831423081.

The spelling of 2155845 in words is "two million, one hundred fifty-five thousand, eight hundred forty-five".