2097805 has 4 divisors (see below), whose sum is σ = 2517372. Its totient is φ = 1678240.

The previous prime is 2097803. The next prime is 2097829. The reversal of 2097805 is 5087902.

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

It can be written as a sum of positive squares in 2 ways, for example, as 872356 + 1225449 = 934^2 + 1107^2 .

It is not a de Polignac number, because 2097805 - 2¹ = 2097803 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 2²¹ + 0 + 9 + 7 + 8³ + 0 + 5³ .

It is a Duffinian number.

2097805 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2097803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209776 + ... + 209785.

It is an arithmetic number, because the mean of its divisors is an integer number (629343).

2^2097805 is an apocalyptic number.

It is an amenable number.

2097805 is a deficient number, since it is larger than the sum of its proper divisors (419567).

2097805 is an equidigital number, since it uses as much as digits as its factorization.

2097805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419566.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 2097805 is about 1448.3801296621. The cubic root of 2097805 is about 128.0132839403.

The spelling of 2097805 in words is "two million, ninety-seven thousand, eight hundred five".