1223445 has 8 divisors (see below), whose sum is σ = 1957536. Its totient is φ = 652496.

The previous prime is 1223437. The next prime is 1223447. The reversal of 1223445 is 5443221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1223445 - 2³ = 1223437 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40767 + ... + 40796.

It is an arithmetic number, because the mean of its divisors is an integer number (244692).

2^1223445 is an apocalyptic number.

1223445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1223445 is a deficient number, since it is larger than the sum of its proper divisors (734091).

1223445 is an equidigital number, since it uses as much as digits as its factorization.

1223445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81571.

The product of its digits is 960, while the sum is 21.

The square root of 1223445 is about 1106.0944805938. The cubic root of 1223445 is about 106.9534545859.

Adding to 1223445 its reverse (5443221), we get a palindrome (6666666).

It can be divided in two parts, 1 and 223445, that added together give a triangular number (223446 = T₆₆₈).

The spelling of 1223445 in words is "one million, two hundred twenty-three thousand, four hundred forty-five".