155445 has 16 divisors (see below), whose sum is σ = 255552. Its totient is φ = 80640.

The previous prime is 155443. The next prime is 155453. The reversal of 155445 is 544551.

It is not a de Polignac number, because 155445 - 2¹ = 155443 is a prime.

155445 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 525 + ... + 765.

It is an arithmetic number, because the mean of its divisors is an integer number (15972).

2¹⁵⁵⁴⁴⁵ is an apocalyptic number.

155445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155445 is a deficient number, since it is larger than the sum of its proper divisors (100107).

155445 is a wasteful number, since it uses less digits than its factorization.

155445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292.

The product of its digits is 2000, while the sum is 24.

The square root of 155445 is about 394.2651392147. The cubic root of 155445 is about 53.7682108836.

Adding to 155445 its reverse (544551), we get a palindrome (699996).

It can be divided in two parts, 15 and 5445, that added together give a triangular number (5460 = T₁₀₄).

The spelling of 155445 in words is "one hundred fifty-five thousand, four hundred forty-five".