157809 has 8 divisors (see below), whose sum is σ = 215712. Its totient is φ = 102560.

The previous prime is 157799. The next prime is 157813. The reversal of 157809 is 908751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157809 - 2⁴ = 157793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519 + ... + 764.

It is an arithmetic number, because the mean of its divisors is an integer number (26964).

2¹⁵⁷⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

157809 is a deficient number, since it is larger than the sum of its proper divisors (57903).

157809 is a wasteful number, since it uses less digits than its factorization.

157809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 157809 is about 397.2518093099. The cubic root of 157809 is about 54.0394088185.

The spelling of 157809 in words is "one hundred fifty-seven thousand, eight hundred nine".