421731 has 12 divisors (see below), whose sum is σ = 622752. Its totient is φ = 274896.

The previous prime is 421727. The next prime is 421739. The reversal of 421731 is 137124.

It is not a de Polignac number, because 421731 - 2² = 421727 is a prime.

It is a super-2 number, since 2×421731² = 355714072722, which contains 22 as substring.

421731 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 421731.

It is not an unprimeable number, because it can be changed into a prime (421739) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76 + ... + 921.

It is an arithmetic number, because the mean of its divisors is an integer number (51896).

2⁴²¹⁷³¹ is an apocalyptic number.

421731 is a deficient number, since it is larger than the sum of its proper divisors (201021).

421731 is a wasteful number, since it uses less digits than its factorization.

421731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050 (or 1047 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 421731 is about 649.4081921257. The cubic root of 421731 is about 74.9914656956.

Adding to 421731 its reverse (137124), we get a palindrome (558855).

The spelling of 421731 in words is "four hundred twenty-one thousand, seven hundred thirty-one".