1223406 has 12 divisors (see below), whose sum is σ = 2650752. Its totient is φ = 407796.

The previous prime is 1223381. The next prime is 1223419. The reversal of 1223406 is 6043221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 67967 = 1223406 / (1 + 2 + 2 + 3 + 4 + 0 + 6).

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33966 + ... + 34001.

It is an arithmetic number, because the mean of its divisors is an integer number (220896).

2^1223406 is an apocalyptic number.

1223406 is an abundant number, since it is smaller than the sum of its proper divisors (1427346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1223406 is a wasteful number, since it uses less digits than its factorization.

1223406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67975 (or 67972 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1223406 is about 1106.0768508562. The cubic root of 1223406 is about 106.9523181150.

Adding to 1223406 its reverse (6043221), we get a palindrome (7266627).

The spelling of 1223406 in words is "one million, two hundred twenty-three thousand, four hundred six".