421445 has 8 divisors (see below), whose sum is σ = 522240. Its totient is φ = 326160.

The previous prime is 421433. The next prime is 421453. The reversal of 421445 is 544124.

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

It is not a de Polignac number, because 421445 - 2⁶ = 421381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1205 + ... + 1514.

It is an arithmetic number, because the mean of its divisors is an integer number (65280).

2⁴²¹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

421445 is a deficient number, since it is larger than the sum of its proper divisors (100795).

421445 is a wasteful number, since it uses less digits than its factorization.

421445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2755.

The product of its digits is 640, while the sum is 20.

The square root of 421445 is about 649.1879542937. The cubic root of 421445 is about 74.9745098562.

Adding to 421445 its reverse (544124), we get a palindrome (965569).

The spelling of 421445 in words is "four hundred twenty-one thousand, four hundred forty-five".