13128172 has 12 divisors (see below), whose sum is σ = 23044840. Its totient is φ = 6543936.

The previous prime is 13128169. The next prime is 13128187. The reversal of 13128172 is 27182131.

It is a happy number.

It is a super-3 number, since 3×13128172³ (a number of 22 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3522 + ... + 6217.

Almost surely, 2^13128172 is an apocalyptic number.

It is an amenable number.

13128172 is a deficient number, since it is larger than the sum of its proper divisors (9916668).

13128172 is a wasteful number, since it uses less digits than its factorization.

13128172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10080 (or 10078 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 13128172 is about 3623.2819376913. The cubic root of 13128172 is about 235.9037000570.

The spelling of 13128172 in words is "thirteen million, one hundred twenty-eight thousand, one hundred seventy-two".