13787971 has 4 divisors (see below), whose sum is σ = 14387472. Its totient is φ = 13188472.

The previous prime is 13787959. The next prime is 13787989. The reversal of 13787971 is 17978731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17978731 = 19 ⋅946249.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13787971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13787911) 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, 299716 + ... + 299761.

It is an arithmetic number, because the mean of its divisors is an integer number (3596868).

Almost surely, 2^13787971 is an apocalyptic number.

13787971 is a deficient number, since it is larger than the sum of its proper divisors (599501).

13787971 is an equidigital number, since it uses as much as digits as its factorization.

13787971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599500.

The product of its digits is 74088, while the sum is 43.

The square root of 13787971 is about 3713.2157222548. The cubic root of 13787971 is about 239.7913174435.

The spelling of 13787971 in words is "thirteen million, seven hundred eighty-seven thousand, nine hundred seventy-one".