421743 has 24 divisors (see below), whose sum is σ = 693120. Its totient is φ = 226800.

The previous prime is 421741. The next prime is 421783. The reversal of 421743 is 347124.

It is not a de Polignac number, because 421743 - 2¹ = 421741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

421743 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2718 + ... + 2868.

It is an arithmetic number, because the mean of its divisors is an integer number (28880).

2⁴²¹⁷⁴³ is an apocalyptic number.

421743 is a deficient number, since it is larger than the sum of its proper divisors (271377).

421743 is a wasteful number, since it uses less digits than its factorization.

421743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 180 counting only the distinct ones).

The product of its digits is 672, while the sum is 21.

The square root of 421743 is about 649.4174312413. The cubic root of 421743 is about 74.9921769618.

Adding to 421743 its reverse (347124), we get a palindrome (768867).

The spelling of 421743 in words is "four hundred twenty-one thousand, seven hundred forty-three", and thus it is an iban number.