2155005 has 40 divisors (see below), whose sum is σ = 4103352. Its totient is φ = 1078272.

The previous prime is 2155003. The next prime is 2155007. The reversal of 2155005 is 5005512.

It is an interprime number because it is at equal distance from previous prime (2155003) and next prime (2155007).

It can be written as a sum of positive squares in 4 ways, for example, as 29241 + 2125764 = 171^2 + 1458^2 .

It is not a de Polignac number, because 2155005 - 2¹ = 2155003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155003) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6729 + ... + 7041.

2^2155005 is an apocalyptic number.

It is an amenable number.

2155005 is a deficient number, since it is larger than the sum of its proper divisors (1948347).

2155005 is a wasteful number, since it uses less digits than its factorization.

2155005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 2155005 is about 1467.9935285961. The cubic root of 2155005 is about 129.1663618908.

The spelling of 2155005 in words is "two million, one hundred fifty-five thousand, five".