309941 has 4 divisors (see below), whose sum is σ = 315084. Its totient is φ = 304800.

The previous prime is 309937. The next prime is 309977. The reversal of 309941 is 149903.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23716 + 286225 = 154^2 + 535^2 .

It is a cyclic number.

It is not a de Polignac number, because 309941 - 2² = 309937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 309941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2480 + ... + 2601.

It is an arithmetic number, because the mean of its divisors is an integer number (78771).

2³⁰⁹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

309941 is a deficient number, since it is larger than the sum of its proper divisors (5143).

309941 is an equidigital number, since it uses as much as digits as its factorization.

309941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5142.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 309941 is about 556.7234501977. The cubic root of 309941 is about 67.6747006350.

The spelling of 309941 in words is "three hundred nine thousand, nine hundred forty-one".