421816 has 8 divisors (see below), whose sum is σ = 790920. Its totient is φ = 210904.

The previous prime is 421807. The next prime is 421831. The reversal of 421816 is 618124.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26356 + ... + 26371.

It is an arithmetic number, because the mean of its divisors is an integer number (98865).

2⁴²¹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

421816 is a deficient number, since it is larger than the sum of its proper divisors (369104).

421816 is a wasteful number, since it uses less digits than its factorization.

421816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52733 (or 52729 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 421816 is about 649.4736330291. The cubic root of 421816 is about 74.9965035407.

The spelling of 421816 in words is "four hundred twenty-one thousand, eight hundred sixteen".