1205523 has 36 divisors (see below), whose sum is σ = 2033304. Its totient is φ = 712800.

The previous prime is 1205513. The next prime is 1205527. The reversal of 1205523 is 3255021.

Added to its reverse (3255021) it gives a square (4460544 = 2112²).

It is a happy number.

It is not a de Polignac number, because 1205523 - 2⁶ = 1205459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1205496 and 1205505.

It is not an unprimeable number, because it can be changed into a prime (1205527) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 29383 + ... + 29423.

2^1205523 is an apocalyptic number.

1205523 is a deficient number, since it is larger than the sum of its proper divisors (827781).

1205523 is an equidigital number, since it uses as much as digits as its factorization.

1205523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 1205523 is about 1097.9631141345. The cubic root of 1205523 is about 106.4286369768.

Adding to 1205523 its reverse (3255021), we get a square (4460544 = 2112²).

It can be divided in two parts, 1205 and 523, that added together give a cube (1728 = 12³).

The spelling of 1205523 in words is "one million, two hundred five thousand, five hundred twenty-three".