13420987 has 2 divisors, whose sum is σ = 13420988. Its totient is φ = 13420986.

The previous prime is 13420961. The next prime is 13420999. The reversal of 13420987 is 78902431.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13420987 is a prime.

It is not a weakly prime, because it can be changed into another prime (13420387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6710493 + 6710494.

It is an arithmetic number, because the mean of its divisors is an integer number (6710494).

Almost surely, 2^13420987 is an apocalyptic number.

13420987 is a deficient number, since it is larger than the sum of its proper divisors (1).

13420987 is an equidigital number, since it uses as much as digits as its factorization.

13420987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 13420987 is about 3663.4665277576. The cubic root of 13420987 is about 237.6447103317.

The spelling of 13420987 in words is "thirteen million, four hundred twenty thousand, nine hundred eighty-seven".