1223765 has 4 divisors (see below), whose sum is σ = 1468524. Its totient is φ = 979008.

The previous prime is 1223753. The next prime is 1223767. The reversal of 1223765 is 5673221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5673221 = 151 ⋅37571.

It can be written as a sum of positive squares in 2 ways, for example, as 465124 + 758641 = 682^2 + 871^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223765 - 2⁴ = 1223749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122372 + ... + 122381.

It is an arithmetic number, because the mean of its divisors is an integer number (367131).

2^1223765 is an apocalyptic number.

It is an amenable number.

1223765 is a deficient number, since it is larger than the sum of its proper divisors (244759).

1223765 is an equidigital number, since it uses as much as digits as its factorization.

1223765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244758.

The product of its digits is 2520, while the sum is 26.

The square root of 1223765 is about 1106.2391242403. The cubic root of 1223765 is about 106.9627785637.

Adding to 1223765 its reverse (5673221), we get a palindrome (6896986).

The spelling of 1223765 in words is "one million, two hundred twenty-three thousand, seven hundred sixty-five".