155745 has 12 divisors (see below), whose sum is σ = 270036. Its totient is φ = 83040.

The previous prime is 155741. The next prime is 155747. The reversal of 155745 is 547551.

It can be written as a sum of positive squares in 2 ways, for example, as 42849 + 112896 = 207^2 + 336^2 .

It is not a de Polignac number, because 155745 - 2² = 155741 is a prime.

It is a super-3 number, since 3×155745³ = 11333488125355875, which contains 333 as substring.

155745 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (155741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1686 + ... + 1775.

It is an arithmetic number, because the mean of its divisors is an integer number (22503).

2¹⁵⁵⁷⁴⁵ is an apocalyptic number.

155745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155745 is a deficient number, since it is larger than the sum of its proper divisors (114291).

155745 is a wasteful number, since it uses less digits than its factorization.

155745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3472 (or 3469 counting only the distinct ones).

The product of its digits is 3500, while the sum is 27.

The square root of 155745 is about 394.6454104636. The cubic root of 155745 is about 53.8027785172.

It can be divided in two parts, 155 and 745, that added together give a square (900 = 30²).

The spelling of 155745 in words is "one hundred fifty-five thousand, seven hundred forty-five".