1223555 has 4 divisors (see below), whose sum is σ = 1468272. Its totient is φ = 978840.

The previous prime is 1223549. The next prime is 1223561. The reversal of 1223555 is 5553221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5553221 = 131 ⋅42391.

It is an interprime number because it is at equal distance from previous prime (1223549) and next prime (1223561).

It is not a de Polignac number, because 1223555 - 2⁶ = 1223491 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1223555.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122351 + ... + 122360.

It is an arithmetic number, because the mean of its divisors is an integer number (367068).

2^1223555 is an apocalyptic number.

1223555 is a deficient number, since it is larger than the sum of its proper divisors (244717).

1223555 is an equidigital number, since it uses as much as digits as its factorization.

1223555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244716.

The product of its digits is 1500, while the sum is 23.

The square root of 1223555 is about 1106.1442039807. The cubic root of 1223555 is about 106.9566598866.

Adding to 1223555 its reverse (5553221), we get a palindrome (6776776).

The spelling of 1223555 in words is "one million, two hundred twenty-three thousand, five hundred fifty-five".