545440 has 48 divisors (see below), whose sum is σ = 1475712. Its totient is φ = 186624.

The previous prime is 545437. The next prime is 545443. The reversal of 545440 is 44545.

It is an interprime number because it is at equal distance from previous prime (545437) and next prime (545443).

It is not an unprimeable number, because it can be changed into a prime (545443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 877 + ... + 1363.

It is an arithmetic number, because the mean of its divisors is an integer number (30744).

2⁵⁴⁵⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 545440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (737856).

545440 is an abundant number, since it is smaller than the sum of its proper divisors (930272).

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

545440 is a wasteful number, since it uses less digits than its factorization.

545440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 545440 is about 738.5390984911. The cubic root of 545440 is about 81.7050677841.

Adding to 545440 its reverse (44545), we get a palindrome (589985).

The spelling of 545440 in words is "five hundred forty-five thousand, four hundred forty".