2155775 has 12 divisors (see below), whose sum is σ = 2725272. Its totient is φ = 1691040.

The previous prime is 2155733. The next prime is 2155781. The reversal of 2155775 is 5775512.

It is not a de Polignac number, because 2155775 - 2⁶ = 2155711 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 512 + ... + 2138.

It is an arithmetic number, because the mean of its divisors is an integer number (227106).

2^2155775 is an apocalyptic number.

2155775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2155775 is a deficient number, since it is larger than the sum of its proper divisors (569497).

2155775 is a wasteful number, since it uses less digits than its factorization.

2155775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690 (or 1685 counting only the distinct ones).

The product of its digits is 12250, while the sum is 32.

The square root of 2155775 is about 1468.2557679097. The cubic root of 2155775 is about 129.1817441065.

The spelling of 2155775 in words is "two million, one hundred fifty-five thousand, seven hundred seventy-five".