45809 has 4 divisors (see below), whose sum is σ = 48240. Its totient is φ = 43380.

The previous prime is 45779. The next prime is 45817. The reversal of 45809 is 90854.

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: 90854 = 2 ⋅45427.

It is a cyclic number.

It is not a de Polignac number, because 45809 - 2⁸ = 45553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45869) 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, 1187 + ... + 1224.

It is an arithmetic number, because the mean of its divisors is an integer number (12060).

2⁴⁵⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

45809 is a deficient number, since it is larger than the sum of its proper divisors (2431).

45809 is a wasteful number, since it uses less digits than its factorization.

45809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 45809 is about 214.0303716765. The cubic root of 45809 is about 35.7808184543.

The spelling of 45809 in words is "forty-five thousand, eight hundred nine".