1223745 has 16 divisors (see below), whose sum is σ = 2073600. Its totient is φ = 614144.

The previous prime is 1223731. The next prime is 1223749. The reversal of 1223745 is 5473221.

It is a cyclic number.

It is not a de Polignac number, because 1223745 - 2⁸ = 1223489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1223749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2145 + ... + 2654.

It is an arithmetic number, because the mean of its divisors is an integer number (129600).

2^1223745 is an apocalyptic number.

1223745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1223745 is a deficient number, since it is larger than the sum of its proper divisors (849855).

1223745 is a wasteful number, since it uses less digits than its factorization.

1223745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4824.

The product of its digits is 1680, while the sum is 24.

The square root of 1223745 is about 1106.2300845665. The cubic root of 1223745 is about 106.9621958627.

Adding to 1223745 its reverse (5473221), we get a palindrome (6696966).

The spelling of 1223745 in words is "one million, two hundred twenty-three thousand, seven hundred forty-five".