421685 has 24 divisors (see below), whose sum is σ = 603288. Its totient is φ = 281600.

The previous prime is 421661. The next prime is 421691. The reversal of 421685 is 586124.

It can be written as a sum of positive squares in 4 ways, for example, as 14641 + 407044 = 121^2 + 638^2 .

It is not a de Polignac number, because 421685 - 2⁶ = 421621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10265 + ... + 10305.

It is an arithmetic number, because the mean of its divisors is an integer number (25137).

2⁴²¹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

421685 is a deficient number, since it is larger than the sum of its proper divisors (181603).

421685 is a wasteful number, since it uses less digits than its factorization.

421685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 74 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 421685 is about 649.3727742984. The cubic root of 421685 is about 74.9887390500.

The spelling of 421685 in words is "four hundred twenty-one thousand, six hundred eighty-five".