3997842 has 16 divisors (see below), whose sum is σ = 8074560. Its totient is φ = 1319472.

The previous prime is 3997811. The next prime is 3997849. The reversal of 3997842 is 2487993.

It is a junction number, because it is equal to n+sod(n) for n = 3997794 and 3997803.

It is not an unprimeable number, because it can be changed into a prime (3997849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2617 + ... + 3852.

It is an arithmetic number, because the mean of its divisors is an integer number (504660).

Almost surely, 2^3997842 is an apocalyptic number.

3997842 is an abundant number, since it is smaller than the sum of its proper divisors (4076718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3997842 is a wasteful number, since it uses less digits than its factorization.

3997842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6577.

The product of its digits is 108864, while the sum is 42.

The square root of 3997842 is about 1999.4604272153. The cubic root of 3997842 is about 158.7115532994.

The spelling of 3997842 in words is "three million, nine hundred ninety-seven thousand, eight hundred forty-two".