1222605 has 24 divisors (see below), whose sum is σ = 2148120. Its totient is φ = 643200.

The previous prime is 1222603. The next prime is 1222633. The reversal of 1222605 is 5062221.

It can be written as a sum of positive squares in 4 ways, for example, as 145161 + 1077444 = 381^2 + 1038^2 .

It is not a de Polignac number, because 1222605 - 2¹ = 1222603 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4411 + ... + 4679.

It is an arithmetic number, because the mean of its divisors is an integer number (89505).

2^1222605 is an apocalyptic number.

1222605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1222605 is a deficient number, since it is larger than the sum of its proper divisors (925515).

1222605 is a wasteful number, since it uses less digits than its factorization.

1222605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1222605 is about 1105.7147009966. The cubic root of 1222605 is about 106.9289714063.

Adding to 1222605 its reverse (5062221), we get a palindrome (6284826).

It can be divided in two parts, 122260 and 5, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 1222605 in words is "one million, two hundred twenty-two thousand, six hundred five".