12420129 has 16 divisors (see below), whose sum is σ = 17537600. Its totient is φ = 7796736.

The previous prime is 12420097. The next prime is 12420131. The reversal of 12420129 is 92102421.

It is not a de Polignac number, because 12420129 - 2⁵ = 12420097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12420139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10437 + ... + 11565.

It is an arithmetic number, because the mean of its divisors is an integer number (1096100).

Almost surely, 2^12420129 is an apocalyptic number.

12420129 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12420129 is a deficient number, since it is larger than the sum of its proper divisors (5117471).

12420129 is a wasteful number, since it uses less digits than its factorization.

12420129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 12420129 is about 3524.2203393091. The cubic root of 12420129 is about 231.5840806559.

The spelling of 12420129 in words is "twelve million, four hundred twenty thousand, one hundred twenty-nine".