1205623 has 4 divisors (see below), whose sum is σ = 1276560. Its totient is φ = 1134688.

The previous prime is 1205609. The next prime is 1205627. The reversal of 1205623 is 3265021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1205623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1205623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205627) 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, 35443 + ... + 35476.

It is an arithmetic number, because the mean of its divisors is an integer number (319140).

2^1205623 is an apocalyptic number.

1205623 is a deficient number, since it is larger than the sum of its proper divisors (70937).

1205623 is an equidigital number, since it uses as much as digits as its factorization.

1205623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70936.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 1205623 is about 1098.0086520606. The cubic root of 1205623 is about 106.4315797022.

Subtracting from 1205623 its sum of digits (19), we obtain a square (1205604 = 1098²).

The spelling of 1205623 in words is "one million, two hundred five thousand, six hundred twenty-three".