78441839 has 8 divisors (see below), whose sum is σ = 92739360. Its totient is φ = 64917216.

The previous prime is 78441829. The next prime is 78441911. The reversal of 78441839 is 93814487.

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

It is not a de Polignac number, because 78441839 - 2²⁰ = 77393263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78441839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78441829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193004 + ... + 193409.

It is an arithmetic number, because the mean of its divisors is an integer number (11592420).

Almost surely, 2^78441839 is an apocalyptic number.

78441839 is a deficient number, since it is larger than the sum of its proper divisors (14297521).

78441839 is a wasteful number, since it uses less digits than its factorization.

78441839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386449.

The product of its digits is 193536, while the sum is 44.

The square root of 78441839 is about 8856.7397500435. The cubic root of 78441839 is about 428.0711133911.

The spelling of 78441839 in words is "seventy-eight million, four hundred forty-one thousand, eight hundred thirty-nine".