78143 has 4 divisors (see below), whose sum is σ = 84168. Its totient is φ = 72120.

The previous prime is 78139. The next prime is 78157. The reversal of 78143 is 34187.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34187 = 17 ⋅2011.

It is a cyclic number.

It is not a de Polignac number, because 78143 - 2² = 78139 is a prime.

It is a super-2 number, since 2×78143² = 12212656898, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78163) 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, 2993 + ... + 3018.

It is an arithmetic number, because the mean of its divisors is an integer number (21042).

2⁷⁸¹⁴³ is an apocalyptic number.

78143 is a deficient number, since it is larger than the sum of its proper divisors (6025).

78143 is a wasteful number, since it uses less digits than its factorization.

78143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6024.

The product of its digits is 672, while the sum is 23.

The square root of 78143 is about 279.5406947119. The cubic root of 78143 is about 42.7526815686.

Subtracting from 78143 its reverse (34187), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 78143 in words is "seventy-eight thousand, one hundred forty-three".