723646 has 32 divisors (see below), whose sum is σ = 1400832. Its totient is φ = 272160.

The previous prime is 723623. The next prime is 723661. The reversal of 723646 is 646327.

723646 is nontrivially palindromic in base 13.

It is a congruent number.

It is an unprimeable number.

723646 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 15 ways as a sum of consecutive naturals, for example, 5635 + ... + 5761.

It is an arithmetic number, because the mean of its divisors is an integer number (43776).

2⁷²³⁶⁴⁶ is an apocalyptic number.

723646 is a deficient number, since it is larger than the sum of its proper divisors (677186).

723646 is a wasteful number, since it uses less digits than its factorization.

723646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184.

The product of its digits is 6048, while the sum is 28.

The square root of 723646 is about 850.6738505444. The cubic root of 723646 is about 89.7791291818.

It can be divided in two parts, 723 and 646, that added together give a square (1369 = 37²).

The spelling of 723646 in words is "seven hundred twenty-three thousand, six hundred forty-six".