723838 has 4 divisors (see below), whose sum is σ = 1085760. Its totient is φ = 361918.

The previous prime is 723829. The next prime is 723839. The reversal of 723838 is 838327.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723839) by changing a digit.

723838 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 as a sum of consecutive naturals, namely, 180958 + ... + 180961.

It is an arithmetic number, because the mean of its divisors is an integer number (271440).

2⁷²³⁸³⁸ is an apocalyptic number.

723838 is a deficient number, since it is larger than the sum of its proper divisors (361922).

723838 is a wasteful number, since it uses less digits than its factorization.

723838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361921.

The product of its digits is 8064, while the sum is 31.

The square root of 723838 is about 850.7866947714. The cubic root of 723838 is about 89.7870686386.

The spelling of 723838 in words is "seven hundred twenty-three thousand, eight hundred thirty-eight".