3991396 has 24 divisors (see below), whose sum is σ = 7499520. Its totient is φ = 1852032.

The previous prime is 3991369. The next prime is 3991399. The reversal of 3991396 is 6931993.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5001 + ... + 5743.

It is an arithmetic number, because the mean of its divisors is an integer number (312480).

Almost surely, 2^3991396 is an apocalyptic number.

It is an amenable number.

3991396 is a deficient number, since it is larger than the sum of its proper divisors (3508124).

3991396 is a wasteful number, since it uses less digits than its factorization.

3991396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843 (or 841 counting only the distinct ones).

The product of its digits is 39366, while the sum is 40.

The square root of 3991396 is about 1997.8478420540. The cubic root of 3991396 is about 158.6262068372.

The spelling of 3991396 in words is "three million, nine hundred ninety-one thousand, three hundred ninety-six".