78139343 has 4 divisors (see below), whose sum is σ = 82251960. Its totient is φ = 74026728.

The previous prime is 78139339. The next prime is 78139351. The reversal of 78139343 is 34393187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34393187 = 139 ⋅247433.

It is a cyclic number.

It is not a de Polignac number, because 78139343 - 2² = 78139339 is a prime.

It is a super-2 number, since 2×78139343² = 12211513848943298, 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 = 78139297 and 78139306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78139393) 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, 2056280 + ... + 2056317.

It is an arithmetic number, because the mean of its divisors is an integer number (20562990).

Almost surely, 2^78139343 is an apocalyptic number.

78139343 is a deficient number, since it is larger than the sum of its proper divisors (4112617).

78139343 is a wasteful number, since it uses less digits than its factorization.

78139343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4112616.

The product of its digits is 54432, while the sum is 38.

The square root of 78139343 is about 8839.6460902007. The cubic root of 78139343 is about 427.5201463324.

The spelling of 78139343 in words is "seventy-eight million, one hundred thirty-nine thousand, three hundred forty-three".