3998042 has 4 divisors (see below), whose sum is σ = 5997066. Its totient is φ = 1999020.

The previous prime is 3998041. The next prime is 3998069. The reversal of 3998042 is 2408993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2253001 + 1745041 = 1501^2 + 1321^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3997993 and 3998011.

It is not an unprimeable number, because it can be changed into a prime (3998041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999509 + ... + 999512.

Almost surely, 2^3998042 is an apocalyptic number.

3998042 is a deficient number, since it is larger than the sum of its proper divisors (1999024).

3998042 is a wasteful number, since it uses less digits than its factorization.

3998042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999023.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 3998042 is about 1999.5104400828. The cubic root of 3998042 is about 158.7141998756.

The spelling of 3998042 in words is "three million, nine hundred ninety-eight thousand, forty-two".