723605 has 8 divisors (see below), whose sum is σ = 919512. Its totient is φ = 544768.

The previous prime is 723601. The next prime is 723607. The reversal of 723605 is 506327.

723605 = 601² + 602².

It can be written as a sum of positive squares in 4 ways, for example, as 362404 + 361201 = 602^2 + 601^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 723605 - 2² = 723601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4172 + ... + 4341.

It is an arithmetic number, because the mean of its divisors is an integer number (114939).

2⁷²³⁶⁰⁵ is an apocalyptic number.

723605 is the 602-nd centered square number.

It is an amenable number.

723605 is a deficient number, since it is larger than the sum of its proper divisors (195907).

723605 is a wasteful number, since it uses less digits than its factorization.

723605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8535.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 723605 is about 850.6497516605. The cubic root of 723605 is about 89.7774335950. Note that the first 3 decimals are identical.

It can be divided in two parts, 72 and 3605, that multiplied together give a triangular number (259560 = T₇₂₀).

The spelling of 723605 in words is "seven hundred twenty-three thousand, six hundred five".