13657971 has 8 divisors (see below), whose sum is σ = 18372240. Its totient is φ = 9024512.

The previous prime is 13657957. The next prime is 13657981. The reversal of 13657971 is 17975631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13657971 - 2⁵ = 13657939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13657981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19806 + ... + 20483.

It is an arithmetic number, because the mean of its divisors is an integer number (2296530).

Almost surely, 2^13657971 is an apocalyptic number.

13657971 is a deficient number, since it is larger than the sum of its proper divisors (4714269).

13657971 is a wasteful number, since it uses less digits than its factorization.

13657971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40405.

The product of its digits is 39690, while the sum is 39.

The square root of 13657971 is about 3695.6692222113. The cubic root of 13657971 is about 239.0353116246.

The spelling of 13657971 in words is "thirteen million, six hundred fifty-seven thousand, nine hundred seventy-one".