155806 has 16 divisors (see below), whose sum is σ = 276480. Its totient is φ = 64440.

The previous prime is 155801. The next prime is 155809. The reversal of 155806 is 608551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155801) by changing a digit.

155806 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255 + ... + 613.

It is an arithmetic number, because the mean of its divisors is an integer number (17280).

2¹⁵⁵⁸⁰⁶ is an apocalyptic number.

155806 is a deficient number, since it is larger than the sum of its proper divisors (120674).

155806 is a wasteful number, since it uses less digits than its factorization.

155806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399.

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

The square root of 155806 is about 394.7226874655. The cubic root of 155806 is about 53.8098018376.

It can be divided in two parts, 155 and 806, that added together give a square (961 = 31²).

The spelling of 155806 in words is "one hundred fifty-five thousand, eight hundred six".