4011985 has 8 divisors (see below), whose sum is σ = 4830696. Its totient is φ = 3198720.

The previous prime is 4011979. The next prime is 4011991. The reversal of 4011985 is 5891104.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (4011979) and next prime (4011991).

It can be written as a sum of positive squares in 4 ways, for example, as 123201 + 3888784 = 351^2 + 1972^2 .

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

It is not a de Polignac number, because 4011985 - 2³ = 4011977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495 + ... + 2875.

It is an arithmetic number, because the mean of its divisors is an integer number (603837).

Almost surely, 2^4011985 is an apocalyptic number.

It is an amenable number.

4011985 is a deficient number, since it is larger than the sum of its proper divisors (818711).

4011985 is a wasteful number, since it uses less digits than its factorization.

4011985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2723.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 4011985 is about 2002.9940089776. The cubic root of 4011985 is about 158.8984887964.

It can be divided in two parts, 40119 and 85, that added together give a palindrome (40204).

The spelling of 4011985 in words is "four million, eleven thousand, nine hundred eighty-five".