155600 has 30 divisors (see below), whose sum is σ = 374790. Its totient is φ = 62080.

The previous prime is 155599. The next prime is 155609. The reversal of 155600 is 6551.

It can be written as a sum of positive squares in 3 ways, for example, as 1936 + 153664 = 44^2 + 392^2 .

It is a super-2 number, since 2×155600² = 48422720000, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 206 + ... + 594.

It is an arithmetic number, because the mean of its divisors is an integer number (12493).

2¹⁵⁵⁶⁰⁰ is an apocalyptic number.

155600 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 155600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187395).

155600 is an abundant number, since it is smaller than the sum of its proper divisors (219190).

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

155600 is a wasteful number, since it uses less digits than its factorization.

155600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 155600 is about 394.4616584663. The cubic root of 155600 is about 53.7860763755.

The spelling of 155600 in words is "one hundred fifty-five thousand, six hundred".