147809 has 4 divisors (see below), whose sum is σ = 149760. Its totient is φ = 145860.

The previous prime is 147799. The next prime is 147811. The reversal of 147809 is 908741.

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 147809 - 2⁴ = 147793 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 147809.

It is not an unprimeable number, because it can be changed into a prime (147859) 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, 857 + ... + 1014.

It is an arithmetic number, because the mean of its divisors is an integer number (37440).

2¹⁴⁷⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

147809 is a deficient number, since it is larger than the sum of its proper divisors (1951).

147809 is an equidigital number, since it uses as much as digits as its factorization.

147809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 147809 is about 384.4593606612. The cubic root of 147809 is about 52.8729602389.

The spelling of 147809 in words is "one hundred forty-seven thousand, eight hundred nine".