3998618 has 16 divisors (see below), whose sum is σ = 6521256. Its totient is φ = 1827840.

The previous prime is 3998609. The next prime is 3998623. The reversal of 3998618 is 8168993.

3998618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 840889 + 3157729 = 917^2 + 1777^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2258 + ... + 3618.

Almost surely, 2^3998618 is an apocalyptic number.

3998618 is a deficient number, since it is larger than the sum of its proper divisors (2522638).

3998618 is a wasteful number, since it uses less digits than its factorization.

3998618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489.

The product of its digits is 93312, while the sum is 44.

The square root of 3998618 is about 1999.6544701523. The cubic root of 3998618 is about 158.7218215222.

It can be divided in two parts, 39986 and 18, that added together give a palindrome (40004).

The spelling of 3998618 in words is "three million, nine hundred ninety-eight thousand, six hundred eighteen".