545420 has 12 divisors (see below), whose sum is σ = 1145424. Its totient is φ = 218160.

The previous prime is 545387. The next prime is 545429. The reversal of 545420 is 24545.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 27271 = 545420 / (5 + 4 + 5 + 4 + 2 + 0).

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 545392 and 545401.

It is not an unprimeable number, because it can be changed into a prime (545429) by changing a digit.

545420 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 13616 + ... + 13655.

It is an arithmetic number, because the mean of its divisors is an integer number (95452).

2⁵⁴⁵⁴²⁰ is an apocalyptic number.

It is an amenable number.

545420 is an abundant number, since it is smaller than the sum of its proper divisors (600004).

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

545420 is a wasteful number, since it uses less digits than its factorization.

545420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27280 (or 27278 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 545420 is about 738.5255581224. The cubic root of 545420 is about 81.7040691278.

Adding to 545420 its reverse (24545), we get a palindrome (569965).

The spelling of 545420 in words is "five hundred forty-five thousand, four hundred twenty".