1223405 has 16 divisors (see below), whose sum is σ = 1600560. Its totient is φ = 893952.

The previous prime is 1223381. The next prime is 1223419. The reversal of 1223405 is 5043221.

It can be written as a sum of positive squares in 8 ways, for example, as 33124 + 1190281 = 182^2 + 1091^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223405 - 2⁸ = 1223149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2951 + ... + 3339.

It is an arithmetic number, because the mean of its divisors is an integer number (100035).

2^1223405 is an apocalyptic number.

It is an amenable number.

1223405 is a deficient number, since it is larger than the sum of its proper divisors (377155).

1223405 is a wasteful number, since it uses less digits than its factorization.

1223405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 1223405 is about 1106.0763988080. The cubic root of 1223405 is about 106.9522889744.

Adding to 1223405 its reverse (5043221), we get a palindrome (6266626).

The spelling of 1223405 in words is "one million, two hundred twenty-three thousand, four hundred five".