13191908 has 12 divisors (see below), whose sum is σ = 23204412. Its totient is φ = 6562080.

The previous prime is 13191907. The next prime is 13191911. The reversal of 13191908 is 80919131.

It can be written as a sum of positive squares in 2 ways, for example, as 12902464 + 289444 = 3592^2 + 538^2 .

It is not an unprimeable number, because it can be changed into a prime (13191901) by changing a digit.

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, 7583 + ... + 9158.

It is an arithmetic number, because the mean of its divisors is an integer number (1933701).

Almost surely, 2^13191908 is an apocalyptic number.

It is an amenable number.

13191908 is a deficient number, since it is larger than the sum of its proper divisors (10012504).

13191908 is a wasteful number, since it uses less digits than its factorization.

13191908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16942 (or 16940 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 13191908 is about 3632.0666293448. The cubic root of 13191908 is about 236.2848470942.

The spelling of 13191908 in words is "thirteen million, one hundred ninety-one thousand, nine hundred eight".