75409 has 4 divisors (see below), whose sum is σ = 76516. Its totient is φ = 74304.

The previous prime is 75407. The next prime is 75431. The reversal of 75409 is 90457.

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 61009 + 14400 = 247^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 75409 - 2¹ = 75407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75401) 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, 444 + ... + 589.

It is an arithmetic number, because the mean of its divisors is an integer number (19129).

2⁷⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

75409 is a deficient number, since it is larger than the sum of its proper divisors (1107).

75409 is a wasteful number, since it uses less digits than its factorization.

75409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 75409 is about 274.6069918993. The cubic root of 75409 is about 42.2481529951.

It can be divided in two parts, 75 and 409, that added together give a palindrome (484).

The spelling of 75409 in words is "seventy-five thousand, four hundred nine".