12129619 has 18 divisors (see below), whose sum is σ = 13857980. Its totient is φ = 10585152.

The previous prime is 12129617. The next prime is 12129659. The reversal of 12129619 is 91692121.

12129619 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12129619 - 2¹ = 12129617 is a prime.

It is a super-2 number, since 2×12129619² = 294255314170322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12129617) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 258054 + ... + 258100.

Almost surely, 2^12129619 is an apocalyptic number.

12129619 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12129619 is a deficient number, since it is larger than the sum of its proper divisors (1728361).

12129619 is an equidigital number, since it uses as much as digits as its factorization.

12129619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 83 counting only the distinct ones).

The product of its digits is 1944, while the sum is 31.

The square root of 12129619 is about 3482.7602558890. The cubic root of 12129619 is about 229.7642133101.

The spelling of 12129619 in words is "twelve million, one hundred twenty-nine thousand, six hundred nineteen".