3940191 has 8 divisors (see below), whose sum is σ = 5837360. Its totient is φ = 2626776.

The previous prime is 3940177. The next prime is 3940207. The reversal of 3940191 is 1910493.

It is not a de Polignac number, because 3940191 - 2⁵ = 3940159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 145933 = 3940191 / (3 + 9 + 4 + 0 + 1 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3940121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72940 + ... + 72993.

It is an arithmetic number, because the mean of its divisors is an integer number (729670).

Almost surely, 2^3940191 is an apocalyptic number.

3940191 is a deficient number, since it is larger than the sum of its proper divisors (1897169).

3940191 is a wasteful number, since it uses less digits than its factorization.

3940191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145942 (or 145936 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 3940191 is about 1984.9914357498. The cubic root of 3940191 is about 157.9449549213.

The spelling of 3940191 in words is "three million, nine hundred forty thousand, one hundred ninety-one".