4015985 has 8 divisors (see below), whose sum is σ = 4931520. Its totient is φ = 3137904.

The previous prime is 4015981. The next prime is 4015987. The reversal of 4015985 is 5895104.

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

It is a cyclic number.

It is not a de Polignac number, because 4015985 - 2² = 4015981 is a prime.

It is a super-2 number, since 2×4015985² = 32256271040450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4015981) 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 in 7 ways as a sum of consecutive naturals, for example, 9125 + ... + 9554.

It is an arithmetic number, because the mean of its divisors is an integer number (616440).

Almost surely, 2^4015985 is an apocalyptic number.

It is an amenable number.

4015985 is a deficient number, since it is larger than the sum of its proper divisors (915535).

4015985 is a wasteful number, since it uses less digits than its factorization.

4015985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18727.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 4015985 is about 2003.9922654541. The cubic root of 4015985 is about 158.9512791932.

The spelling of 4015985 in words is "four million, fifteen thousand, nine hundred eighty-five".