2206405 has 4 divisors (see below), whose sum is σ = 2647692. Its totient is φ = 1765120.

The previous prime is 2206403. The next prime is 2206417. The reversal of 2206405 is 5046022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5046022 = 2 ⋅2523011.

It can be written as a sum of positive squares in 2 ways, for example, as 263169 + 1943236 = 513^2 + 1394^2 .

It is not a de Polignac number, because 2206405 - 2¹ = 2206403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2206403) 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, 220636 + ... + 220645.

It is an arithmetic number, because the mean of its divisors is an integer number (661923).

2^2206405 is an apocalyptic number.

It is an amenable number.

2206405 is a deficient number, since it is larger than the sum of its proper divisors (441287).

2206405 is an equidigital number, since it uses as much as digits as its factorization.

2206405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441286.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 2206405 is about 1485.3972532626. The cubic root of 2206405 is about 130.1852388836.

The spelling of 2206405 in words is "two million, two hundred six thousand, four hundred five".