3840391 has 2 divisors, whose sum is σ = 3840392. Its totient is φ = 3840390.

The previous prime is 3840359. The next prime is 3840401. The reversal of 3840391 is 1930483.

It is a strong prime.

It is an emirp because it is prime and its reverse (1930483) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3840391 - 2⁵ = 3840359 is a prime.

It is a Chen prime.

3840391 is a lucky number.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3840301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1920195 + 1920196.

It is an arithmetic number, because the mean of its divisors is an integer number (1920196).

Almost surely, 2^3840391 is an apocalyptic number.

3840391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3840391 is an equidigital number, since it uses as much as digits as its factorization.

3840391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 3840391 is about 1959.6915573630. The cubic root of 3840391 is about 156.6000204429.

The spelling of 3840391 in words is "three million, eight hundred forty thousand, three hundred ninety-one".