2195905 has 8 divisors (see below), whose sum is σ = 2644200. Its totient is φ = 1750656.

The previous prime is 2195899. The next prime is 2195911. The reversal of 2195905 is 5095912.

It is an interprime number because it is at equal distance from previous prime (2195899) and next prime (2195911).

It can be written as a sum of positive squares in 4 ways, for example, as 8464 + 2187441 = 92^2 + 1479^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2195905 - 2⁷ = 2195777 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1381 + ... + 2509.

It is an arithmetic number, because the mean of its divisors is an integer number (330525).

2^2195905 is an apocalyptic number.

It is an amenable number.

2195905 is a deficient number, since it is larger than the sum of its proper divisors (448295).

2195905 is a wasteful number, since it uses less digits than its factorization.

2195905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 2195905 is about 1481.8586302343. The cubic root of 2195905 is about 129.9783987777.

The spelling of 2195905 in words is "two million, one hundred ninety-five thousand, nine hundred five".