421608 has 32 divisors (see below), whose sum is σ = 1150560. Its totient is φ = 127680.

The previous prime is 421607. The next prime is 421609. The reversal of 421608 is 806124.

It is an interprime number because it is at equal distance from previous prime (421607) and next prime (421609).

It is not an unprimeable number, because it can be changed into a prime (421607) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 535 + ... + 1062.

It is an arithmetic number, because the mean of its divisors is an integer number (35955).

2⁴²¹⁶⁰⁸ is an apocalyptic number.

It is an amenable number.

421608 is an abundant number, since it is smaller than the sum of its proper divisors (728952).

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

421608 is a wasteful number, since it uses less digits than its factorization.

421608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617 (or 1613 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 421608 is about 649.3134836117. The cubic root of 421608 is about 74.9841744387.

It can be divided in two parts, 4 and 21608, that added together give a palindrome (21612).

The spelling of 421608 in words is "four hundred twenty-one thousand, six hundred eight".