421305 has 8 divisors (see below), whose sum is σ = 674112. Its totient is φ = 224688.

The previous prime is 421303. The next prime is 421313. The reversal of 421305 is 503124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421305 - 2¹ = 421303 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 28087 = 421305 / (4 + 2 + 1 + 3 + 0 + 5).

421305 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (421303) 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, 14029 + ... + 14058.

It is an arithmetic number, because the mean of its divisors is an integer number (84264).

2⁴²¹³⁰⁵ is an apocalyptic number.

It is an amenable number.

421305 is a deficient number, since it is larger than the sum of its proper divisors (252807).

421305 is a wasteful number, since it uses less digits than its factorization.

421305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28095.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 421305 is about 649.0801183213. The cubic root of 421305 is about 74.9662069983.

Adding to 421305 its reverse (503124), we get a palindrome (924429).

The spelling of 421305 in words is "four hundred twenty-one thousand, three hundred five".