78423 has 4 divisors (see below), whose sum is σ = 104568. Its totient is φ = 52280.

The previous prime is 78401. The next prime is 78427. The reversal of 78423 is 32487.

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

It is a cyclic number.

It is not a de Polignac number, because 78423 - 2⁸ = 78167 is a prime.

It is a D-number.

It is a nialpdrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 78393 and 78402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78427) 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, 13068 + ... + 13073.

It is an arithmetic number, because the mean of its divisors is an integer number (26142).

2⁷⁸⁴²³ is an apocalyptic number.

78423 is a deficient number, since it is larger than the sum of its proper divisors (26145).

78423 is a wasteful number, since it uses less digits than its factorization.

78423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26144.

The product of its digits is 1344, while the sum is 24.

The square root of 78423 is about 280.0410684168. The cubic root of 78423 is about 42.8036841386.

The spelling of 78423 in words is "seventy-eight thousand, four hundred twenty-three".