12729145 has 32 divisors (see below), whose sum is σ = 18910080. Its totient is φ = 8087040.

The previous prime is 12729137. The next prime is 12729179. The reversal of 12729145 is 54192721.

12729145 = 605² + 606² + ... + 637².

12729145 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 12729145 - 2³ = 12729137 is a prime.

It is a super-3 number, since 3×12729145³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13117 + ... + 14053.

It is an arithmetic number, because the mean of its divisors is an integer number (590940).

Almost surely, 2^12729145 is an apocalyptic number.

It is an amenable number.

12729145 is a deficient number, since it is larger than the sum of its proper divisors (6180935).

12729145 is a wasteful number, since it uses less digits than its factorization.

12729145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985.

The product of its digits is 5040, while the sum is 31.

The square root of 12729145 is about 3567.7927350114. The cubic root of 12729145 is about 233.4889925069.

The spelling of 12729145 in words is "twelve million, seven hundred twenty-nine thousand, one hundred forty-five".