3925991 has 8 divisors (see below), whose sum is σ = 4083600. Its totient is φ = 3769920.

The previous prime is 3925981. The next prime is 3925993. The reversal of 3925991 is 1995293.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3925991 - 2⁶ = 3925927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3925993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9395 + ... + 9803.

It is an arithmetic number, because the mean of its divisors is an integer number (510450).

Almost surely, 2^3925991 is an apocalyptic number.

3925991 is a deficient number, since it is larger than the sum of its proper divisors (157609).

3925991 is a wasteful number, since it uses less digits than its factorization.

3925991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769.

The product of its digits is 21870, while the sum is 38.

The square root of 3925991 is about 1981.4113656684. The cubic root of 3925991 is about 157.7549879836.

The spelling of 3925991 in words is "three million, nine hundred twenty-five thousand, nine hundred ninety-one".