421869 has 8 divisors (see below), whose sum is σ = 642880. Its totient is φ = 241056.

The previous prime is 421847. The next prime is 421891. The reversal of 421869 is 968124.

It is an interprime number because it is at equal distance from previous prime (421847) and next prime (421891).

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

It is not a de Polignac number, because 421869 - 2⁷ = 421741 is a prime.

It is a super-2 number, since 2×421869² = 355946906322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421469) 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, 10024 + ... + 10065.

It is an arithmetic number, because the mean of its divisors is an integer number (80360).

421869 is a Friedman number, since it can be written as (84-9)^(2+1)-6, using all its digits and the basic arithmetic operations.

2⁴²¹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

421869 is a deficient number, since it is larger than the sum of its proper divisors (221011).

421869 is a wasteful number, since it uses less digits than its factorization.

421869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20099.

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

The square root of 421869 is about 649.5144340198. The cubic root of 421869 is about 74.9996444428. Note that the first 3 decimals are identical.

It can be divided in two parts, 42186 and 9, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 421869 in words is "four hundred twenty-one thousand, eight hundred sixty-nine".