2190655 has 4 divisors (see below), whose sum is σ = 2628792. Its totient is φ = 1752520.

The previous prime is 2190653. The next prime is 2190679. The reversal of 2190655 is 5560912.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2190655 - 2¹ = 2190653 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190653) 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 3 ways as a sum of consecutive naturals, for example, 219061 + ... + 219070.

It is an arithmetic number, because the mean of its divisors is an integer number (657198).

2^2190655 is an apocalyptic number.

2190655 is a deficient number, since it is larger than the sum of its proper divisors (438137).

2190655 is an equidigital number, since it uses as much as digits as its factorization.

2190655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438136.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 2190655 is about 1480.0861461415. The cubic root of 2190655 is about 129.8747314004.

The spelling of 2190655 in words is "two million, one hundred ninety thousand, six hundred fifty-five".