421749 has 6 divisors (see below), whose sum is σ = 609206. Its totient is φ = 281160.

The previous prime is 421741. The next prime is 421783. The reversal of 421749 is 947124.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 342225 + 79524 = 585^2 + 282^2 .

It is not a de Polignac number, because 421749 - 2³ = 421741 is a prime.

It is an Ulam number.

It is a Duffinian 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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23422 + ... + 23439.

2⁴²¹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

421749 is a deficient number, since it is larger than the sum of its proper divisors (187457).

421749 is a wasteful number, since it uses less digits than its factorization.

421749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46867 (or 46864 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 421749 is about 649.4220507497. The cubic root of 421749 is about 74.9925325899.

The spelling of 421749 in words is "four hundred twenty-one thousand, seven hundred forty-nine".