3968391 has 16 divisors (see below), whose sum is σ = 6110208. Its totient is φ = 2244000.

The previous prime is 3968387. The next prime is 3968411. The reversal of 3968391 is 1938693.

It is not a de Polignac number, because 3968391 - 2² = 3968387 is a prime.

3968391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3968381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1186 + ... + 3056.

It is an arithmetic number, because the mean of its divisors is an integer number (381888).

Almost surely, 2^3968391 is an apocalyptic number.

3968391 is a deficient number, since it is larger than the sum of its proper divisors (2141817).

3968391 is a wasteful number, since it uses less digits than its factorization.

3968391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982.

The product of its digits is 34992, while the sum is 39.

The square root of 3968391 is about 1992.0820766223. The cubic root of 3968391 is about 158.3208642689.

The spelling of 3968391 in words is "three million, nine hundred sixty-eight thousand, three hundred ninety-one".