309841 has 4 divisors (see below), whose sum is σ = 354112. Its totient is φ = 265572.

The previous prime is 309823. The next prime is 309851. The reversal of 309841 is 148903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 309841 - 2⁷ = 309713 is a prime.

It is a Duffinian number.

309841 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (309811) 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, 22125 + ... + 22138.

It is an arithmetic number, because the mean of its divisors is an integer number (88528).

2³⁰⁹⁸⁴¹ is an apocalyptic number.

It is an amenable number.

309841 is a deficient number, since it is larger than the sum of its proper divisors (44271).

309841 is an equidigital number, since it uses as much as digits as its factorization.

309841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44270.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 309841 is about 556.6336317543. The cubic root of 309841 is about 67.6674216174.

The spelling of 309841 in words is "three hundred nine thousand, eight hundred forty-one".