12915839 has 4 divisors (see below), whose sum is σ = 13595640. Its totient is φ = 12236040.

The previous prime is 12915821. The next prime is 12915883. The reversal of 12915839 is 93851921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93851921 = 79 ⋅1187999.

It is a cyclic number.

It is not a de Polignac number, because 12915839 - 2⁸ = 12915583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12915899) 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 in 3 ways as a sum of consecutive naturals, for example, 339872 + ... + 339909.

It is an arithmetic number, because the mean of its divisors is an integer number (3398910).

Almost surely, 2^12915839 is an apocalyptic number.

12915839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12915839 is a deficient number, since it is larger than the sum of its proper divisors (679801).

12915839 is an equidigital number, since it uses as much as digits as its factorization.

12915839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679800.

The product of its digits is 19440, while the sum is 38.

The square root of 12915839 is about 3593.8612939289. The cubic root of 12915839 is about 234.6249578381.

It can be divided in two parts, 129 and 15839, that multiplied together give a triangular number (2043231 = T₂₀₂₁).

The spelling of 12915839 in words is "twelve million, nine hundred fifteen thousand, eight hundred thirty-nine".