309949 has 4 divisors (see below), whose sum is σ = 318364. Its totient is φ = 301536.

The previous prime is 309937. The next prime is 309977. The reversal of 309949 is 949903.

309949 = T₅₂ + T₅₃ + ... + T₁₂₅.

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 164025 + 145924 = 405^2 + 382^2 .

It is a cyclic number.

It is not a de Polignac number, because 309949 - 2⁹ = 309437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309949.

It is not an unprimeable number, because it can be changed into a prime (309929) 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, 4152 + ... + 4225.

It is an arithmetic number, because the mean of its divisors is an integer number (79591).

2³⁰⁹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

309949 is a deficient number, since it is larger than the sum of its proper divisors (8415).

309949 is an equidigital number, since it uses as much as digits as its factorization.

309949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8414.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 309949 is about 556.7306350471. The cubic root of 309949 is about 67.6752828888.

The spelling of 309949 in words is "three hundred nine thousand, nine hundred forty-nine".