12919139 has 4 divisors (see below), whose sum is σ = 13052424. Its totient is φ = 12785856.

The previous prime is 12919117. The next prime is 12919163. The reversal of 12919139 is 93191921.

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

It is a cyclic number.

It is not a de Polignac number, because 12919139 - 2¹² = 12915043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12919099 and 12919108.

It is not an unprimeable number, because it can be changed into a prime (12919189) 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, 66497 + ... + 66690.

It is an arithmetic number, because the mean of its divisors is an integer number (3263106).

Almost surely, 2^12919139 is an apocalyptic number.

12919139 is a deficient number, since it is larger than the sum of its proper divisors (133285).

12919139 is an equidigital number, since it uses as much as digits as its factorization.

12919139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133284.

The product of its digits is 4374, while the sum is 35.

The square root of 12919139 is about 3594.3203808231. The cubic root of 12919139 is about 234.6449383811.

The spelling of 12919139 in words is "twelve million, nine hundred nineteen thousand, one hundred thirty-nine".