3991594 has 4 divisors (see below), whose sum is σ = 5987394. Its totient is φ = 1995796.

The previous prime is 3991579. The next prime is 3991601. The reversal of 3991594 is 4951993.

3991594 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4951993 = 293 ⋅16901.

It can be written as a sum of positive squares in only one way, i.e., 3330625 + 660969 = 1825^2 + 813^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997897 + ... + 997900.

Almost surely, 2^3991594 is an apocalyptic number.

3991594 is a deficient number, since it is larger than the sum of its proper divisors (1995800).

3991594 is a wasteful number, since it uses less digits than its factorization.

3991594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995799.

The product of its digits is 43740, while the sum is 40.

The square root of 3991594 is about 1997.8973947628. The cubic root of 3991594 is about 158.6288297683.

The spelling of 3991594 in words is "three million, nine hundred ninety-one thousand, five hundred ninety-four".