53139439 has 2 divisors, whose sum is σ = 53139440. Its totient is φ = 53139438.

The previous prime is 53139431. The next prime is 53139481. The reversal of 53139439 is 93493135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 53139439 - 2³ = 53139431 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 53139398 and 53139407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53139431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26569719 + 26569720.

It is an arithmetic number, because the mean of its divisors is an integer number (26569720).

Almost surely, 2^53139439 is an apocalyptic number.

53139439 is a deficient number, since it is larger than the sum of its proper divisors (1).

53139439 is an equidigital number, since it uses as much as digits as its factorization.

53139439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 37.

The square root of 53139439 is about 7289.6803084909. The cubic root of 53139439 is about 375.9577037642.

The spelling of 53139439 in words is "fifty-three million, one hundred thirty-nine thousand, four hundred thirty-nine".