1223145 has 48 divisors (see below), whose sum is σ = 2650752. Its totient is φ = 506880.

The previous prime is 1223119. The next prime is 1223149. The reversal of 1223145 is 5413221.

It is not a de Polignac number, because 1223145 - 2⁸ = 1222889 is a prime.

It is a Curzon number.

1223145 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1223149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3289 + ... + 3641.

It is an arithmetic number, because the mean of its divisors is an integer number (55224).

2^1223145 is an apocalyptic number.

1223145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1223145 is an abundant number, since it is smaller than the sum of its proper divisors (1427607).

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

1223145 is a wasteful number, since it uses less digits than its factorization.

1223145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 379 counting only the distinct ones).

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

The square root of 1223145 is about 1105.9588599943. The cubic root of 1223145 is about 106.9447118800.

Adding to 1223145 its reverse (5413221), we get a palindrome (6636366).

The spelling of 1223145 in words is "one million, two hundred twenty-three thousand, one hundred forty-five".