13387987 has 2 divisors, whose sum is σ = 13387988. Its totient is φ = 13387986.

The previous prime is 13387967. The next prime is 13387991. The reversal of 13387987 is 78978331.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13387987 - 2⁷ = 13387859 is a prime.

It is not a weakly prime, because it can be changed into another prime (13387967) 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 as a sum of consecutive naturals, namely, 6693993 + 6693994.

It is an arithmetic number, because the mean of its divisors is an integer number (6693994).

Almost surely, 2^13387987 is an apocalyptic number.

13387987 is a deficient number, since it is larger than the sum of its proper divisors (1).

13387987 is an equidigital number, since it uses as much as digits as its factorization.

13387987 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 13387987 is about 3658.9598248683. The cubic root of 13387987 is about 237.4497740513.

The spelling of 13387987 in words is "thirteen million, three hundred eighty-seven thousand, nine hundred eighty-seven".