723445 has 8 divisors (see below), whose sum is σ = 889560. Its totient is φ = 564480.

The previous prime is 723439. The next prime is 723451. The reversal of 723445 is 544327.

It is an interprime number because it is at equal distance from previous prime (723439) and next prime (723451).

It can be written as a sum of positive squares in 4 ways, for example, as 27889 + 695556 = 167^2 + 834^2 .

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

It is not a de Polignac number, because 723445 - 2⁵ = 723413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1560 + ... + 1969.

It is an arithmetic number, because the mean of its divisors is an integer number (111195).

2⁷²³⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

723445 is a deficient number, since it is larger than the sum of its proper divisors (166115).

723445 is a wasteful number, since it uses less digits than its factorization.

723445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3575.

The product of its digits is 3360, while the sum is 25.

The square root of 723445 is about 850.5557007040. Note that the first 3 decimals coincide. The cubic root of 723445 is about 89.7708160581.

The spelling of 723445 in words is "seven hundred twenty-three thousand, four hundred forty-five".