3940291 has 4 divisors (see below), whose sum is σ = 4111632. Its totient is φ = 3768952.

The previous prime is 3940289. The next prime is 3940301. The reversal of 3940291 is 1920493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1920493 = 389 ⋅4937.

It is a cyclic number.

It is not a de Polignac number, because 3940291 - 2¹ = 3940289 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (3940231) 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 3 ways as a sum of consecutive naturals, for example, 85636 + ... + 85681.

It is an arithmetic number, because the mean of its divisors is an integer number (1027908).

Almost surely, 2^3940291 is an apocalyptic number.

3940291 is a deficient number, since it is larger than the sum of its proper divisors (171341).

3940291 is a wasteful number, since it uses less digits than its factorization.

3940291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171340.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 3940291 is about 1985.0166246155. The cubic root of 3940291 is about 157.9462910969.

It can be divided in two parts, 39402 and 91, that added together give a palindrome (39493).

The spelling of 3940291 in words is "three million, nine hundred forty thousand, two hundred ninety-one".