2155455 has 24 divisors (see below), whose sum is σ = 3934320. Its totient is φ = 1088640.

The previous prime is 2155451. The next prime is 2155463. The reversal of 2155455 is 5545512.

It is not a de Polignac number, because 2155455 - 2² = 2155451 is a prime.

2155455 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 406 + ... + 2115.

It is an arithmetic number, because the mean of its divisors is an integer number (163930).

2^2155455 is an apocalyptic number.

2155455 is a deficient number, since it is larger than the sum of its proper divisors (1778865).

2155455 is a wasteful number, since it uses less digits than its factorization.

2155455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551 (or 2548 counting only the distinct ones).

The product of its digits is 5000, while the sum is 27.

The square root of 2155455 is about 1468.1467910260. The cubic root of 2155455 is about 129.1753519423.

It can be divided in two parts, 21554 and 55, that added together give a square (21609 = 147²).

The spelling of 2155455 in words is "two million, one hundred fifty-five thousand, four hundred fifty-five".