78443189 has 4 divisors (see below), whose sum is σ = 85574400. Its totient is φ = 71311980.

The previous prime is 78443161. The next prime is 78443203. The reversal of 78443189 is 98134487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78443189 - 2⁸ = 78442933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78443089) 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, 3565589 + ... + 3565610.

It is an arithmetic number, because the mean of its divisors is an integer number (21393600).

Almost surely, 2^78443189 is an apocalyptic number.

It is an amenable number.

78443189 is a deficient number, since it is larger than the sum of its proper divisors (7131211).

78443189 is a wasteful number, since it uses less digits than its factorization.

78443189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7131210.

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

The square root of 78443189 is about 8856.8159628616. The cubic root of 78443189 is about 428.0735691073.

The spelling of 78443189 in words is "seventy-eight million, four hundred forty-three thousand, one hundred eighty-nine".