421945 has 4 divisors (see below), whose sum is σ = 506340. Its totient is φ = 337552.

The previous prime is 421943. The next prime is 421973. The reversal of 421945 is 549124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 316969 + 104976 = 563^2 + 324^2 .

It is a cyclic number.

It is not a de Polignac number, because 421945 - 2¹ = 421943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42190 + ... + 42199.

It is an arithmetic number, because the mean of its divisors is an integer number (126585).

2⁴²¹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

421945 is a deficient number, since it is larger than the sum of its proper divisors (84395).

421945 is an equidigital number, since it uses as much as digits as its factorization.

421945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84394.

The product of its digits is 1440, while the sum is 25.

The square root of 421945 is about 649.5729366284. The cubic root of 421945 is about 75.0041479187.

The spelling of 421945 in words is "four hundred twenty-one thousand, nine hundred forty-five".