156805 has 8 divisors (see below), whose sum is σ = 205344. Its totient is φ = 114000.

The previous prime is 156799. The next prime is 156817. The reversal of 156805 is 508651.

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

It is not a de Polignac number, because 156805 - 2³ = 156797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 156805.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1371 + ... + 1480.

It is an arithmetic number, because the mean of its divisors is an integer number (25668).

2¹⁵⁶⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

156805 is a deficient number, since it is larger than the sum of its proper divisors (48539).

156805 is a wasteful number, since it uses less digits than its factorization.

156805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2867.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 156805 is about 395.9861108675. The cubic root of 156805 is about 53.9245631611.

It can be divided in two parts, 15680 and 5, that multiplied together give a square (78400 = 280²).

The spelling of 156805 in words is "one hundred fifty-six thousand, eight hundred five".