421708 has 12 divisors (see below), whose sum is σ = 843472. Its totient is φ = 180720.

The previous prime is 421703. The next prime is 421709. The reversal of 421708 is 807124.

421708 is an admirable number.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421703) by changing a digit.

421708 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7503 + ... + 7558.

2⁴²¹⁷⁰⁸ is an apocalyptic number.

It is an amenable number.

421708 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

421708 is a wasteful number, since it uses less digits than its factorization.

421708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15072 (or 15070 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 421708 is about 649.3904834535. The cubic root of 421708 is about 74.9901023976.

It can be divided in two parts, 4 and 21708, that added together give a palindrome (21712).

The spelling of 421708 in words is "four hundred twenty-one thousand, seven hundred eight".