12138519 has 4 divisors (see below), whose sum is σ = 16184696. Its totient is φ = 8092344.

The previous prime is 12138499. The next prime is 12138521. The reversal of 12138519 is 91583121.

12138519 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12138519 - 2⁵ = 12138487 is a prime.

It is a super-2 number, since 2×12138519² = 294687287026722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138589) 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, 2023084 + ... + 2023089.

It is an arithmetic number, because the mean of its divisors is an integer number (4046174).

Almost surely, 2^12138519 is an apocalyptic number.

12138519 is a deficient number, since it is larger than the sum of its proper divisors (4046177).

12138519 is an equidigital number, since it uses as much as digits as its factorization.

12138519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4046176.

The product of its digits is 2160, while the sum is 30.

The square root of 12138519 is about 3484.0377437680. The cubic root of 12138519 is about 229.8203953869.

The spelling of 12138519 in words is "twelve million, one hundred thirty-eight thousand, five hundred nineteen".