73909309 has 4 divisors (see below), whose sum is σ = 73962460. Its totient is φ = 73856160.

The previous prime is 73909289. The next prime is 73909331. The reversal of 73909309 is 90390937.

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 4853209 + 69056100 = 2203^2 + 8310^2 .

It is a cyclic number.

It is not a de Polignac number, because 73909309 - 2⁷ = 73909181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73909379) 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, 24432 + ... + 27289.

It is an arithmetic number, because the mean of its divisors is an integer number (18490615).

Almost surely, 2^73909309 is an apocalyptic number.

It is an amenable number.

73909309 is a deficient number, since it is larger than the sum of its proper divisors (53151).

73909309 is a wasteful number, since it uses less digits than its factorization.

73909309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53150.

The product of its (nonzero) digits is 45927, while the sum is 40.

The square root of 73909309 is about 8597.0523436815. The cubic root of 73909309 is about 419.6620656596.

The spelling of 73909309 in words is "seventy-three million, nine hundred nine thousand, three hundred nine".