1226605 has 4 divisors (see below), whose sum is σ = 1471932. Its totient is φ = 981280.

The previous prime is 1226593. The next prime is 1226609. The reversal of 1226605 is 5066221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5066221 = 17 ⋅298013.

It can be written as a sum of positive squares in 2 ways, for example, as 405769 + 820836 = 637^2 + 906^2 .

It is not a de Polignac number, because 1226605 - 2¹⁵ = 1193837 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 (1226609) 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, 122656 + ... + 122665.

It is an arithmetic number, because the mean of its divisors is an integer number (367983).

2^1226605 is an apocalyptic number.

It is an amenable number.

1226605 is a deficient number, since it is larger than the sum of its proper divisors (245327).

1226605 is an equidigital number, since it uses as much as digits as its factorization.

1226605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245326.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1226605 is about 1107.5220088107. The cubic root of 1226605 is about 107.0454577282.

The spelling of 1226605 in words is "one million, two hundred twenty-six thousand, six hundred five".