309049 has 4 divisors (see below), whose sum is σ = 332836. Its totient is φ = 285264.

The previous prime is 309037. The next prime is 309059. The reversal of 309049 is 940903.

309049 is nontrivially palindromic in base 12.

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 59049 + 250000 = 243^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 309049 - 2⁹ = 308537 is a prime.

It is a super-2 number, since 2×309049² = 191022568802, which contains 22 as substring.

It is a Duffinian number.

309049 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (309019) 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, 11874 + ... + 11899.

It is an arithmetic number, because the mean of its divisors is an integer number (83209).

2³⁰⁹⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

309049 is a deficient number, since it is larger than the sum of its proper divisors (23787).

309049 is a wasteful number, since it uses less digits than its factorization.

309049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23786.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 309049 is about 555.9217570846. The cubic root of 309049 is about 67.6097164004.

The spelling of 309049 in words is "three hundred nine thousand, forty-nine".