421985 has 8 divisors (see below), whose sum is σ = 520296. Its totient is φ = 328320.

The previous prime is 421973. The next prime is 421987. The reversal of 421985 is 589124.

It can be written as a sum of positive squares in 4 ways, for example, as 134689 + 287296 = 367^2 + 536^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421985 - 2¹⁶ = 356449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421987) 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, 956 + ... + 1325.

It is an arithmetic number, because the mean of its divisors is an integer number (65037).

2⁴²¹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

421985 is a deficient number, since it is larger than the sum of its proper divisors (98311).

421985 is a wasteful number, since it uses less digits than its factorization.

421985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323.

The product of its digits is 2880, while the sum is 29.

The square root of 421985 is about 649.6037253588. The cubic root of 421985 is about 75.0065179521.

The spelling of 421985 in words is "four hundred twenty-one thousand, nine hundred eighty-five".