742823 has 4 divisors (see below), whose sum is σ = 748800. Its totient is φ = 736848.

The previous prime is 742817. The next prime is 742891. The reversal of 742823 is 328247.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328247 = 149 ⋅2203.

It is a cyclic number.

It is not a de Polignac number, because 742823 - 2⁶ = 742759 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 742792 and 742801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2798 + ... + 3051.

It is an arithmetic number, because the mean of its divisors is an integer number (187200).

2⁷⁴²⁸²³ is an apocalyptic number.

742823 is a deficient number, since it is larger than the sum of its proper divisors (5977).

742823 is a wasteful number, since it uses less digits than its factorization.

742823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5976.

The product of its digits is 2688, while the sum is 26.

The square root of 742823 is about 861.8718002116. The cubic root of 742823 is about 90.5652897199.

The spelling of 742823 in words is "seven hundred forty-two thousand, eight hundred twenty-three".