421986 has 16 divisors (see below), whose sum is σ = 860544. Its totient is φ = 137904.

The previous prime is 421973. The next prime is 421987. The reversal of 421986 is 689124.

421986 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421987) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346 + ... + 981.

It is an arithmetic number, because the mean of its divisors is an integer number (53784).

2⁴²¹⁹⁸⁶ is an apocalyptic number.

421986 is an abundant number, since it is smaller than the sum of its proper divisors (438558).

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

421986 is a wasteful number, since it uses less digits than its factorization.

421986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385.

The product of its digits is 3456, while the sum is 30.

The square root of 421986 is about 649.6044950583. The cubic root of 421986 is about 75.0065772010.

The spelling of 421986 in words is "four hundred twenty-one thousand, nine hundred eighty-six".