78493 has 4 divisors (see below), whose sum is σ = 80028. Its totient is φ = 76960.

The previous prime is 78487. The next prime is 78497. The reversal of 78493 is 39487.

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: 39487 = 7 ⋅5641.

It can be written as a sum of positive squares in 2 ways, for example, as 45369 + 33124 = 213^2 + 182^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78493 is a prime.

It is a super-2 number, since 2×78493² = 12322302098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78497) 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, 688 + ... + 793.

It is an arithmetic number, because the mean of its divisors is an integer number (20007).

2⁷⁸⁴⁹³ is an apocalyptic number.

It is an amenable number.

78493 is a deficient number, since it is larger than the sum of its proper divisors (1535).

78493 is a wasteful number, since it uses less digits than its factorization.

78493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534.

The product of its digits is 6048, while the sum is 31.

The square root of 78493 is about 280.1660222083. The cubic root of 78493 is about 42.8164158068.

The spelling of 78493 in words is "seventy-eight thousand, four hundred ninety-three".