421889 has 16 divisors (see below), whose sum is σ = 508032. Its totient is φ = 346368.

The previous prime is 421847. The next prime is 421891. The reversal of 421889 is 988124.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 421889 - 2⁸ = 421633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 421889.

It is not an unprimeable number, because it can be changed into a prime (421189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5042 + ... + 5124.

It is an arithmetic number, because the mean of its divisors is an integer number (31752).

It is a Proth number, since it is equal to 103 ⋅ 2¹² + 1 and 103 < 2¹².

2⁴²¹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

421889 is a deficient number, since it is larger than the sum of its proper divisors (86143).

421889 is a wasteful number, since it uses less digits than its factorization.

421889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136.

The product of its digits is 4608, while the sum is 32.

The square root of 421889 is about 649.5298299539. The cubic root of 421889 is about 75.0008296205. Note that the first 3 decimals are identical.

The spelling of 421889 in words is "four hundred twenty-one thousand, eight hundred eighty-nine".