421916 has 24 divisors (see below), whose sum is σ = 827904. Its totient is φ = 186480.

The previous prime is 421913. The next prime is 421943. The reversal of 421916 is 619124.

It is a happy number.

It is a super-2 number, since 2×421916² = 356026222112, which contains 22 as substring.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 421891 and 421900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1781 + ... + 2003.

It is an arithmetic number, because the mean of its divisors is an integer number (34496).

2⁴²¹⁹¹⁶ is an apocalyptic number.

It is an amenable number.

421916 is a deficient number, since it is larger than the sum of its proper divisors (405988).

421916 is a wasteful number, since it uses less digits than its factorization.

421916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 279 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 421916 is about 649.5506138862. The cubic root of 421916 is about 75.0024295509.

The spelling of 421916 in words is "four hundred twenty-one thousand, nine hundred sixteen".