49309 has 4 divisors (see below), whose sum is σ = 53116. Its totient is φ = 45504.

The previous prime is 49307. The next prime is 49331. The reversal of 49309 is 90394.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90394 = 2 ⋅45197.

It can be written as a sum of positive squares in 2 ways, for example, as 8100 + 41209 = 90^2 + 203^2 .

It is a cyclic number.

It is not a de Polignac number, because 49309 - 2¹ = 49307 is a prime.

It is a Duffinian number.

49309 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1884 + ... + 1909.

It is an arithmetic number, because the mean of its divisors is an integer number (13279).

2⁴⁹³⁰⁹ is an apocalyptic number.

It is an amenable number.

49309 is a deficient number, since it is larger than the sum of its proper divisors (3807).

49309 is a wasteful number, since it uses less digits than its factorization.

49309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3806.

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

The square root of 49309 is about 222.0562991676. The cubic root of 49309 is about 36.6698160748.

Subtracting from 49309 its sum of digits (25), we obtain a square (49284 = 222²).

The spelling of 49309 in words is "forty-nine thousand, three hundred nine".