78438043 has 4 divisors (see below), whose sum is σ = 80351208. Its totient is φ = 76524880.

The previous prime is 78438013. The next prime is 78438047. The reversal of 78438043 is 34083487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34083487 = 17 ⋅2004911.

It is a cyclic number.

It is not a de Polignac number, because 78438043 - 2¹³ = 78429851 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 78437993 and 78438011.

It is not an unprimeable number, because it can be changed into a prime (78438047) 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, 956521 + ... + 956602.

It is an arithmetic number, because the mean of its divisors is an integer number (20087802).

Almost surely, 2^78438043 is an apocalyptic number.

78438043 is a deficient number, since it is larger than the sum of its proper divisors (1913165).

78438043 is a wasteful number, since it uses less digits than its factorization.

78438043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913164.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 78438043 is about 8856.5254473749. The cubic root of 78438043 is about 428.0642081299.

The spelling of 78438043 in words is "seventy-eight million, four hundred thirty-eight thousand, forty-three".