78389843 has 8 divisors (see below), whose sum is σ = 91494912. Its totient is φ = 65761416.

The previous prime is 78389803. The next prime is 78389851. The reversal of 78389843 is 34898387.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-78389843 is a prime.

It is a super-2 number, since 2×78389843² = 12289934971129298, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78389791 and 78389800.

It is not an unprimeable number, because it can be changed into a prime (78389803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118805 + ... + 119462.

It is an arithmetic number, because the mean of its divisors is an integer number (11436864).

Almost surely, 2^78389843 is an apocalyptic number.

78389843 is a deficient number, since it is larger than the sum of its proper divisors (13105069).

78389843 is a wasteful number, since it uses less digits than its factorization.

78389843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238321.

The product of its digits is 1161216, while the sum is 50.

The square root of 78389843 is about 8853.8038717830. The cubic root of 78389843 is about 427.9765086679.

The spelling of 78389843 in words is "seventy-eight million, three hundred eighty-nine thousand, eight hundred forty-three".