421722 has 24 divisors (see below), whose sum is σ = 1044576. Its totient is φ = 120456.

The previous prime is 421717. The next prime is 421727. The reversal of 421722 is 227124.

It is an interprime number because it is at equal distance from previous prime (421717) and next prime (421727).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 421695 and 421704.

It is not an unprimeable number, because it can be changed into a prime (421727) 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, 1548 + ... + 1799.

It is an arithmetic number, because the mean of its divisors is an integer number (43524).

2⁴²¹⁷²² is an apocalyptic number.

421722 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

421722 is an abundant number, since it is smaller than the sum of its proper divisors (622854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421722 is a wasteful number, since it uses less digits than its factorization.

421722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3362 (or 3359 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 421722 is about 649.4012627028. The cubic root of 421722 is about 74.9909322371.

Adding to 421722 its reverse (227124), we get a palindrome (648846).

It can be divided in two parts, 42 and 1722, that added together give a square (1764 = 42²).

The spelling of 421722 in words is "four hundred twenty-one thousand, seven hundred twenty-two", and thus it is an iban number.