53445 has 16 divisors (see below), whose sum is σ = 97920. Its totient is φ = 24384.

The previous prime is 53441. The next prime is 53453. The reversal of 53445 is 54435.

Added to its reverse (54435) it gives a triangular number (107880 = T₄₆₄).

It is a happy number.

It is not a de Polignac number, because 53445 - 2² = 53441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150 + ... + 359.

It is an arithmetic number, because the mean of its divisors is an integer number (6120).

2⁵³⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

53445 is a deficient number, since it is larger than the sum of its proper divisors (44475).

53445 is a wasteful number, since it uses less digits than its factorization.

53445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its digits is 1200, while the sum is 21.

The square root of 53445 is about 231.1817466843. The cubic root of 53445 is about 37.6676934310.

Adding to 53445 its product of digits (1200), we get a palindrome (54645).

Adding to 53445 its reverse (54435), we get a triangular number (107880 = T₄₆₄).

Subtracting 53445 from its reverse (54435), we obtain a triangular number (990 = T₄₄).

The spelling of 53445 in words is "fifty-three thousand, four hundred forty-five".