4181987 has 2 divisors, whose sum is σ = 4181988. Its totient is φ = 4181986.

The previous prime is 4181981. The next prime is 4182011. The reversal of 4181987 is 7891814.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4181987 - 2²⁰ = 3133411 is a prime.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 4181987.

It is not a weakly prime, because it can be changed into another prime (4181981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2090993 + 2090994.

It is an arithmetic number, because the mean of its divisors is an integer number (2090994).

Almost surely, 2^4181987 is an apocalyptic number.

4181987 is a deficient number, since it is larger than the sum of its proper divisors (1).

4181987 is an equidigital number, since it uses as much as digits as its factorization.

4181987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 38.

The square root of 4181987 is about 2044.9907090253. The cubic root of 4181987 is about 161.1118777961. Note that the first 3 decimals are identical.

Adding to 4181987 its sum of digits (38), we get a square (4182025 = 2045²).

It can be divided in two parts, 41819 and 87, that multiplied together give a triangular number (3638253 = T₂₆₉₇).

The spelling of 4181987 in words is "four million, one hundred eighty-one thousand, nine hundred eighty-seven".