421866 has 24 divisors (see below), whose sum is σ = 954720. Its totient is φ = 134376.

The previous prime is 421847. The next prime is 421891. The reversal of 421866 is 668124.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96 + ... + 923.

It is an arithmetic number, because the mean of its divisors is an integer number (39780).

2⁴²¹⁸⁶⁶ is an apocalyptic number.

421866 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

421866 is an abundant number, since it is smaller than the sum of its proper divisors (532854).

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

421866 is a wasteful number, since it uses less digits than its factorization.

421866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050 (or 1047 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 421866 is about 649.5121245981. The cubic root of 421866 is about 74.9994666629. Note that the first 3 decimals are identical.

It can be divided in two parts, 42186 and 6, that multiplied together give a triangular number (253116 = T₇₁₁).

The spelling of 421866 in words is "four hundred twenty-one thousand, eight hundred sixty-six".