13172840 has 16 divisors (see below), whose sum is σ = 29638980. Its totient is φ = 5269120.

The previous prime is 13172839. The next prime is 13172869. The reversal of 13172840 is 4827131.

It can be written as a sum of positive squares in 2 ways, for example, as 13147876 + 24964 = 3626^2 + 158^2 .

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 3 ways as a sum of consecutive naturals, for example, 164621 + ... + 164700.

Almost surely, 2^13172840 is an apocalyptic number.

13172840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13172840 is an abundant number, since it is smaller than the sum of its proper divisors (16466140).

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

13172840 is a wasteful number, since it uses less digits than its factorization.

13172840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329332 (or 329328 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 13172840 is about 3629.4407282665. The cubic root of 13172840 is about 236.1709476745.

Adding to 13172840 its reverse (4827131), we get a palindrome (17999971).

The spelling of 13172840 in words is "thirteen million, one hundred seventy-two thousand, eight hundred forty".