155730 has 32 divisors (see below), whose sum is σ = 388800. Its totient is φ = 39872.

The previous prime is 155723. The next prime is 155731. The reversal of 155730 is 37551.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 155697 and 155706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155731) by changing a digit.

155730 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 15 ways as a sum of consecutive naturals, for example, 781 + ... + 959.

It is an arithmetic number, because the mean of its divisors is an integer number (12150).

2¹⁵⁵⁷³⁰ is an apocalyptic number.

155730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194400).

155730 is an abundant number, since it is smaller than the sum of its proper divisors (233070).

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

155730 is a wasteful number, since it uses less digits than its factorization.

155730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218.

The product of its (nonzero) digits is 525, while the sum is 21.

The square root of 155730 is about 394.6264056041. The cubic root of 155730 is about 53.8010511903.

The spelling of 155730 in words is "one hundred fifty-five thousand, seven hundred thirty".