157805 has 8 divisors (see below), whose sum is σ = 194712. Its totient is φ = 122688.

The previous prime is 157799. The next prime is 157813. The reversal of 157805 is 508751.

157805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 11881 + 145924 = 109^2 + 382^2 .

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 157805 - 2¹⁰ = 156781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242 + ... + 611.

It is an arithmetic number, because the mean of its divisors is an integer number (24339).

2¹⁵⁷⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

157805 is a deficient number, since it is larger than the sum of its proper divisors (36907).

157805 is an equidigital number, since it uses as much as digits as its factorization.

157805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 157805 is about 397.2467746880. The cubic root of 157805 is about 54.0389522339.

The spelling of 157805 in words is "one hundred fifty-seven thousand, eight hundred five".