52078139 has 4 divisors (see below), whose sum is σ = 52583856. Its totient is φ = 51572424.

The previous prime is 52078111. The next prime is 52078181. The reversal of 52078139 is 93187025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52078139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 52078099 and 52078108.

It is not an unprimeable number, because it can be changed into a prime (52078189) 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, 252704 + ... + 252909.

It is an arithmetic number, because the mean of its divisors is an integer number (13145964).

Almost surely, 2^52078139 is an apocalyptic number.

52078139 is a deficient number, since it is larger than the sum of its proper divisors (505717).

52078139 is a wasteful number, since it uses less digits than its factorization.

52078139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505716.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 52078139 is about 7216.5184819274. The cubic root of 52078139 is about 373.4379802483.

The spelling of 52078139 in words is "fifty-two million, seventy-eight thousand, one hundred thirty-nine".