723638 has 8 divisors (see below), whose sum is σ = 1092000. Its totient is φ = 359640.

The previous prime is 723623. The next prime is 723661. The reversal of 723638 is 836327.

723638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 723638.

It is a congruent number.

It is an unprimeable number.

723638 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638 + ... + 1361.

It is an arithmetic number, because the mean of its divisors is an integer number (136500).

2⁷²³⁶³⁸ is an apocalyptic number.

723638 is a deficient number, since it is larger than the sum of its proper divisors (368362).

723638 is a wasteful number, since it uses less digits than its factorization.

723638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2182.

The product of its digits is 6048, while the sum is 29.

The square root of 723638 is about 850.6691483767. The cubic root of 723638 is about 89.7787983406.

The spelling of 723638 in words is "seven hundred twenty-three thousand, six hundred thirty-eight".