12125819 has 4 divisors (see below), whose sum is σ = 12764040. Its totient is φ = 11487600.

The previous prime is 12125809. The next prime is 12125837. The reversal of 12125819 is 91852121.

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 12125819 - 2⁴ = 12125803 is a prime.

It is a super-2 number, since 2×12125819² = 294070972841522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12125791 and 12125800.

It is not an unprimeable number, because it can be changed into a prime (12125809) 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, 319082 + ... + 319119.

It is an arithmetic number, because the mean of its divisors is an integer number (3191010).

Almost surely, 2^12125819 is an apocalyptic number.

12125819 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12125819 is a deficient number, since it is larger than the sum of its proper divisors (638221).

12125819 is an equidigital number, since it uses as much as digits as its factorization.

12125819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638220.

The product of its digits is 1440, while the sum is 29.

The square root of 12125819 is about 3482.2146688566. The cubic root of 12125819 is about 229.7402170850.

The spelling of 12125819 in words is "twelve million, one hundred twenty-five thousand, eight hundred nineteen".