605421 has 16 divisors (see below), whose sum is σ = 950400. Its totient is φ = 379584.

The previous prime is 605413. The next prime is 605443. The reversal of 605421 is 124506.

It is a happy number.

It is not a de Polignac number, because 605421 - 2³ = 605413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 605394 and 605403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (605401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201 + ... + 1118.

It is an arithmetic number, because the mean of its divisors is an integer number (59400).

2⁶⁰⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

605421 is a deficient number, since it is larger than the sum of its proper divisors (344979).

605421 is a wasteful number, since it uses less digits than its factorization.

605421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345 (or 1339 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 605421 is about 778.0880412910. The cubic root of 605421 is about 84.5965191466.

Adding to 605421 its reverse (124506), we get a palindrome (729927).

The spelling of 605421 in words is "six hundred five thousand, four hundred twenty-one".