13987837 has 4 divisors (see below), whose sum is σ = 14090076. Its totient is φ = 13885600.

The previous prime is 13987807. The next prime is 13987843. The reversal of 13987837 is 73878931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73878931 = 7 ⋅10554133.

It can be written as a sum of positive squares in 2 ways, for example, as 3818116 + 10169721 = 1954^2 + 3189^2 .

It is a cyclic number.

It is not a de Polignac number, because 13987837 - 2²³ = 5599229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13987807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50914 + ... + 51187.

It is an arithmetic number, because the mean of its divisors is an integer number (3522519).

Almost surely, 2^13987837 is an apocalyptic number.

It is an amenable number.

13987837 is a deficient number, since it is larger than the sum of its proper divisors (102239).

13987837 is a wasteful number, since it uses less digits than its factorization.

13987837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102238.

The product of its digits is 254016, while the sum is 46.

The square root of 13987837 is about 3740.0316843578. The cubic root of 13987837 is about 240.9444096227.

The spelling of 13987837 in words is "thirteen million, nine hundred eighty-seven thousand, eight hundred thirty-seven".