13538839 has 2 divisors, whose sum is σ = 13538840. Its totient is φ = 13538838.

The previous prime is 13538827. The next prime is 13538843. The reversal of 13538839 is 93883531.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13538839 - 2¹¹ = 13536791 is a prime.

It is a super-2 number, since 2×13538839² = 366600322935842, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13538879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6769419 + 6769420.

It is an arithmetic number, because the mean of its divisors is an integer number (6769420).

Almost surely, 2^13538839 is an apocalyptic number.

13538839 is a deficient number, since it is larger than the sum of its proper divisors (1).

13538839 is an equidigital number, since it uses as much as digits as its factorization.

13538839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 13538839 is about 3679.5161366680. The cubic root of 13538839 is about 238.3382838665.

The spelling of 13538839 in words is "thirteen million, five hundred thirty-eight thousand, eight hundred thirty-nine".