13975987 has 2 divisors, whose sum is σ = 13975988. Its totient is φ = 13975986.

The previous prime is 13975981. The next prime is 13975991. The reversal of 13975987 is 78957931.

13975987 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13975987 - 2⁷ = 13975859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13975987.

It is not a weakly prime, because it can be changed into another prime (13975981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6987993 + 6987994.

It is an arithmetic number, because the mean of its divisors is an integer number (6987994).

Almost surely, 2^13975987 is an apocalyptic number.

13975987 is a deficient number, since it is larger than the sum of its proper divisors (1).

13975987 is an equidigital number, since it uses as much as digits as its factorization.

13975987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 49.

The square root of 13975987 is about 3738.4471375158. The cubic root of 13975987 is about 240.8763505438.

The spelling of 13975987 in words is "thirteen million, nine hundred seventy-five thousand, nine hundred eighty-seven".