3995842 has 4 divisors (see below), whose sum is σ = 5993766. Its totient is φ = 1997920.

The previous prime is 3995837. The next prime is 3995843. The reversal of 3995842 is 2485993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2485993 = 37 ⋅67189.

It can be written as a sum of positive squares in only one way, i.e., 3493161 + 502681 = 1869^2 + 709^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 3995795 and 3995804.

It is not an unprimeable number, because it can be changed into a prime (3995843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998959 + ... + 998962.

Almost surely, 2^3995842 is an apocalyptic number.

3995842 is a deficient number, since it is larger than the sum of its proper divisors (1997924).

3995842 is a wasteful number, since it uses less digits than its factorization.

3995842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997923.

The product of its digits is 77760, while the sum is 40.

The square root of 3995842 is about 1998.9602297194. The cubic root of 3995842 is about 158.6850826807.

It can be divided in two parts, 39958 and 42, that added together give a square (40000 = 200²).

The spelling of 3995842 in words is "three million, nine hundred ninety-five thousand, eight hundred forty-two".