73985809 has 4 divisors (see below), whose sum is σ = 76372480. Its totient is φ = 71599140.

The previous prime is 73985803. The next prime is 73985831. The reversal of 73985809 is 90858937.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73985809 - 2⁵ = 73985777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73985803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1193289 + ... + 1193350.

It is an arithmetic number, because the mean of its divisors is an integer number (19093120).

Almost surely, 2^73985809 is an apocalyptic number.

It is an amenable number.

73985809 is a deficient number, since it is larger than the sum of its proper divisors (2386671).

73985809 is a wasteful number, since it uses less digits than its factorization.

73985809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2386670.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 73985809 is about 8601.5003923734. The cubic root of 73985809 is about 419.8068064613.

The spelling of 73985809 in words is "seventy-three million, nine hundred eighty-five thousand, eight hundred nine".