421345 has 8 divisors (see below), whose sum is σ = 535464. Its totient is φ = 317184.

The previous prime is 421339. The next prime is 421349. The reversal of 421345 is 543124.

421345 = T₅₄ + T₅₅ + ... + T₁₃₈.

It can be written as a sum of positive squares in 4 ways, for example, as 159201 + 262144 = 399^2 + 512^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 421345 - 2⁵ = 421313 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2394 + ... + 2563.

It is an arithmetic number, because the mean of its divisors is an integer number (66933).

2⁴²¹³⁴⁵ is an apocalyptic number.

It is an amenable number.

421345 is a deficient number, since it is larger than the sum of its proper divisors (114119).

421345 is a wasteful number, since it uses less digits than its factorization.

421345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4979.

The product of its digits is 480, while the sum is 19.

The square root of 421345 is about 649.1109304271. The cubic root of 421345 is about 74.9685794311.

Adding to 421345 its reverse (543124), we get a palindrome (964469).

The spelling of 421345 in words is "four hundred twenty-one thousand, three hundred forty-five".