13172805 has 24 divisors (see below), whose sum is σ = 22963200. Its totient is φ = 6985440.

The previous prime is 13172791. The next prime is 13172827. The reversal of 13172805 is 50827131.

It is not a de Polignac number, because 13172805 - 2¹² = 13168709 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8220 + ... + 9690.

It is an arithmetic number, because the mean of its divisors is an integer number (956800).

Almost surely, 2^13172805 is an apocalyptic number.

13172805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13172805 is a deficient number, since it is larger than the sum of its proper divisors (9790395).

13172805 is a wasteful number, since it uses less digits than its factorization.

13172805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 13172805 is about 3629.4359065838. The cubic root of 13172805 is about 236.1707385070.

Adding to 13172805 its reverse (50827131), we get a palindrome (63999936).

The spelling of 13172805 in words is "thirteen million, one hundred seventy-two thousand, eight hundred five".