4191985 has 8 divisors (see below), whose sum is σ = 5749056. Its totient is φ = 2874480.

The previous prime is 4191983. The next prime is 4191991. The reversal of 4191985 is 5891914.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4191985 - 2¹ = 4191983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4191983) 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 in 7 ways as a sum of consecutive naturals, for example, 59851 + ... + 59920.

It is an arithmetic number, because the mean of its divisors is an integer number (718632).

Almost surely, 2^4191985 is an apocalyptic number.

It is an amenable number.

4191985 is a deficient number, since it is larger than the sum of its proper divisors (1557071).

4191985 is a wasteful number, since it uses less digits than its factorization.

4191985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119783.

The product of its digits is 12960, while the sum is 37.

The square root of 4191985 is about 2047.4337596123. The cubic root of 4191985 is about 161.2401672589.

It can be divided in two parts, 41919 and 85, that multiplied together give a triangular number (3563115 = T₂₆₆₉).

The spelling of 4191985 in words is "four million, one hundred ninety-one thousand, nine hundred eighty-five".