78243 has 8 divisors (see below), whose sum is σ = 113856. Its totient is φ = 47400.

The previous prime is 78241. The next prime is 78259. The reversal of 78243 is 34287.

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

It is not a de Polignac number, because 78243 - 2¹ = 78241 is a prime.

It is a super-2 number, since 2×78243² = 12243934098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1153 + ... + 1218.

It is an arithmetic number, because the mean of its divisors is an integer number (14232).

2⁷⁸²⁴³ is an apocalyptic number.

78243 is a deficient number, since it is larger than the sum of its proper divisors (35613).

78243 is a wasteful number, since it uses less digits than its factorization.

78243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385.

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

The square root of 78243 is about 279.7195023591. The cubic root of 78243 is about 42.7709107372.

Subtracting from 78243 its reverse (34287), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 78243 in words is "seventy-eight thousand, two hundred forty-three".