12135420 has 144 divisors (see below), whose sum is σ = 41827968. Its totient is φ = 2928960.

The previous prime is 12135413. The next prime is 12135443. The reversal of 12135420 is 2453121.

12135420 is a `hidden beast` number, since 121 + 3 + 542 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12135393 and 12135402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53347 + ... + 53573.

It is an arithmetic number, because the mean of its divisors is an integer number (290472).

Almost surely, 2^12135420 is an apocalyptic number.

12135420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12135420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20913984).

12135420 is an abundant number, since it is smaller than the sum of its proper divisors (29692548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12135420 is a wasteful number, since it uses less digits than its factorization.

12135420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 12135420 is about 3483.5929727797. The cubic root of 12135420 is about 229.8008357788.

Adding to 12135420 its reverse (2453121), we get a palindrome (14588541).

The spelling of 12135420 in words is "twelve million, one hundred thirty-five thousand, four hundred twenty".