3991082 has 4 divisors (see below), whose sum is σ = 5986626. Its totient is φ = 1995540.

The previous prime is 3991051. The next prime is 3991087. The reversal of 3991082 is 2801993.

3991082 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2801993 = 1009 ⋅2777.

It can be written as a sum of positive squares in only one way, i.e., 3759721 + 231361 = 1939^2 + 481^2 .

It is not an unprimeable number, because it can be changed into a prime (3991087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997769 + ... + 997772.

Almost surely, 2^3991082 is an apocalyptic number.

3991082 is a deficient number, since it is larger than the sum of its proper divisors (1995544).

3991082 is a wasteful number, since it uses less digits than its factorization.

3991082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995543.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 3991082 is about 1997.7692559452. The cubic root of 3991082 is about 158.6220470616.

It can be divided in two parts, 399108 and 2, that multiplied together give a triangular number (798216 = T₁₂₆₃).

The spelling of 3991082 in words is "three million, nine hundred ninety-one thousand, eighty-two".