4099391 has 4 divisors (see below), whose sum is σ = 4176792. Its totient is φ = 4021992.

The previous prime is 4099369. The next prime is 4099441. The reversal of 4099391 is 1939904.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4099391 - 2¹⁸ = 3837247 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 (4099321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38621 + ... + 38726.

It is an arithmetic number, because the mean of its divisors is an integer number (1044198).

Almost surely, 2^4099391 is an apocalyptic number.

4099391 is a deficient number, since it is larger than the sum of its proper divisors (77401).

4099391 is an equidigital number, since it uses as much as digits as its factorization.

4099391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77400.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 4099391 is about 2024.6952857159. The cubic root of 4099391 is about 160.0441414668.

The spelling of 4099391 in words is "four million, ninety-nine thousand, three hundred ninety-one".