1205723 has 4 divisors (see below), whose sum is σ = 1210968. Its totient is φ = 1200480.

The previous prime is 1205717. The next prime is 1205731. The reversal of 1205723 is 3275021.

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

It is a cyclic number.

It is not a de Polignac number, because 1205723 - 2⁴ = 1205707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1205695 and 1205704.

It is not an unprimeable number, because it can be changed into a prime (1205713) 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, 2261 + ... + 2742.

It is an arithmetic number, because the mean of its divisors is an integer number (302742).

2^1205723 is an apocalyptic number.

1205723 is a deficient number, since it is larger than the sum of its proper divisors (5245).

1205723 is an equidigital number, since it uses as much as digits as its factorization.

1205723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 1205723 is about 1098.0541880982. The cubic root of 1205723 is about 106.4345222649.

The spelling of 1205723 in words is "one million, two hundred five thousand, seven hundred twenty-three".