2122405 has 4 divisors (see below), whose sum is σ = 2546892. Its totient is φ = 1697920.

The previous prime is 2122381. The next prime is 2122409. The reversal of 2122405 is 5042212.

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 1136356 + 986049 = 1066^2 + 993^2 .

It is not a de Polignac number, because 2122405 - 2⁷ = 2122277 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 (2122409) 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, 212236 + ... + 212245.

It is an arithmetic number, because the mean of its divisors is an integer number (636723).

2^2122405 is an apocalyptic number.

It is an amenable number.

2122405 is a deficient number, since it is larger than the sum of its proper divisors (424487).

2122405 is an equidigital number, since it uses as much as digits as its factorization.

2122405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424486.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 2122405 is about 1456.8476241529. The cubic root of 2122405 is about 128.5117250728.

Adding to 2122405 its reverse (5042212), we get a palindrome (7164617).

The spelling of 2122405 in words is "two million, one hundred twenty-two thousand, four hundred five".