4121987 has 2 divisors, whose sum is σ = 4121988. Its totient is φ = 4121986.

The previous prime is 4121959. The next prime is 4122043. The reversal of 4121987 is 7891214.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4121987 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4121927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2060993 + 2060994.

It is an arithmetic number, because the mean of its divisors is an integer number (2060994).

Almost surely, 2^4121987 is an apocalyptic number.

4121987 is a deficient number, since it is larger than the sum of its proper divisors (1).

4121987 is an equidigital number, since it uses as much as digits as its factorization.

4121987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 4121987 is about 2030.2677163369. The cubic root of 4121987 is about 160.3376593083.

The spelling of 4121987 in words is "four million, one hundred twenty-one thousand, nine hundred eighty-seven".