13987387 has 2 divisors, whose sum is σ = 13987388. Its totient is φ = 13987386.

The previous prime is 13987373. The next prime is 13987397. The reversal of 13987387 is 78378931.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (78378931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13987387 is a prime.

It is not a weakly prime, because it can be changed into another prime (13987357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6993693 + 6993694.

It is an arithmetic number, because the mean of its divisors is an integer number (6993694).

Almost surely, 2^13987387 is an apocalyptic number.

13987387 is a deficient number, since it is larger than the sum of its proper divisors (1).

13987387 is an equidigital number, since it uses as much as digits as its factorization.

13987387 is an odious number, because the sum of its binary digits is odd.

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

The square root of 13987387 is about 3739.9715239558. The cubic root of 13987387 is about 240.9418258030.

The spelling of 13987387 in words is "thirteen million, nine hundred eighty-seven thousand, three hundred eighty-seven".