155000 has 40 divisors (see below), whose sum is σ = 374880. Its totient is φ = 60000.

The previous prime is 154991. The next prime is 155003. The reversal of 155000 is 551.

155000 is nontrivially palindromic in base 9.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (11) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155003) by changing a digit.

155000 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 9 ways as a sum of consecutive naturals, for example, 4985 + ... + 5015.

It is an arithmetic number, because the mean of its divisors is an integer number (9372).

2¹⁵⁵⁰⁰⁰ is an apocalyptic number.

155000 is a gapful number since it is divisible by the number (10) 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 155000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187440).

155000 is an abundant number, since it is smaller than the sum of its proper divisors (219880).

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

155000 is an equidigital number, since it uses as much as digits as its factorization.

155000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 11.

The square root of 155000 is about 393.7003937006. The cubic root of 155000 is about 53.7168535494.

Adding to 155000 its reverse (551), we get a palindrome (155551).

Subtracting from 155000 its reverse (551), we obtain a square (154449 = 393²).

The spelling of 155000 in words is "one hundred fifty-five thousand".