3998942 has 4 divisors (see below), whose sum is σ = 5998416. Its totient is φ = 1999470.

The previous prime is 3998899. The next prime is 3998959. The reversal of 3998942 is 2498993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2498993 = 7 ⋅356999.

It is a junction number, because it is equal to n+sod(n) for n = 3998893 and 3998902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999734 + ... + 999737.

It is an arithmetic number, because the mean of its divisors is an integer number (1499604).

Almost surely, 2^3998942 is an apocalyptic number.

3998942 is a deficient number, since it is larger than the sum of its proper divisors (1999474).

3998942 is a wasteful number, since it uses less digits than its factorization.

3998942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999473.

The product of its digits is 139968, while the sum is 44.

The square root of 3998942 is about 1999.7354825076. The cubic root of 3998942 is about 158.7261083768.

The spelling of 3998942 in words is "three million, nine hundred ninety-eight thousand, nine hundred forty-two".