155856 has 40 divisors (see below), whose sum is σ = 428544. Its totient is φ = 48640.

The previous prime is 155851. The next prime is 155861. The reversal of 155856 is 658551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (155851) and next prime (155861).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155856.

It is not an unprimeable number, because it can be changed into a prime (155851) by changing a digit.

155856 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, 721 + ... + 911.

2¹⁵⁵⁸⁵⁶ is an apocalyptic number.

155856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214272).

155856 is an abundant number, since it is smaller than the sum of its proper divisors (272688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155856 is a wasteful number, since it uses less digits than its factorization.

155856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 213 counting only the distinct ones).

The product of its digits is 6000, while the sum is 30.

The square root of 155856 is about 394.7860179895. The cubic root of 155856 is about 53.8155572906.

The spelling of 155856 in words is "one hundred fifty-five thousand, eight hundred fifty-six".