75909 has 4 divisors (see below), whose sum is σ = 101216. Its totient is φ = 50604.

The previous prime is 75883. The next prime is 75913. The reversal of 75909 is 90957.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90957 = 3 ⋅30319.

It is not a de Polignac number, because 75909 - 2⁷ = 75781 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75979) 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, 12649 + ... + 12654.

It is an arithmetic number, because the mean of its divisors is an integer number (25304).

2⁷⁵⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

75909 is a deficient number, since it is larger than the sum of its proper divisors (25307).

75909 is a wasteful number, since it uses less digits than its factorization.

75909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25306.

The product of its (nonzero) digits is 2835, while the sum is 30.

The square root of 75909 is about 275.5158797601. The cubic root of 75909 is about 42.3413229524.

The spelling of 75909 in words is "seventy-five thousand, nine hundred nine".