3998842 has 16 divisors (see below), whose sum is σ = 6388200. Its totient is φ = 1870848.

The previous prime is 3998837. The next prime is 3998881. The reversal of 3998842 is 2488993.

It is a happy number.

3998842 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 3767481 + 231361 = 1941^2 + 481^2 .

It is an Ulam 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, 11284 + ... + 11632.

Almost surely, 2^3998842 is an apocalyptic number.

3998842 is a deficient number, since it is larger than the sum of its proper divisors (2389358).

3998842 is a wasteful number, since it uses less digits than its factorization.

3998842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705.

The product of its digits is 124416, while the sum is 43.

The square root of 3998842 is about 1999.7104790444. The cubic root of 3998842 is about 158.7247852982.

The spelling of 3998842 in words is "three million, nine hundred ninety-eight thousand, eight hundred forty-two".