421864 has 8 divisors (see below), whose sum is σ = 791010. Its totient is φ = 210928.

The previous prime is 421847. The next prime is 421891. The reversal of 421864 is 468124.

421864 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 396900 + 24964 = 630^2 + 158^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26359 + ... + 26374.

2⁴²¹⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

421864 is a deficient number, since it is larger than the sum of its proper divisors (369146).

421864 is a wasteful number, since it uses less digits than its factorization.

421864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52739 (or 52735 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 421864 is about 649.5105849792. The cubic root of 421864 is about 74.9993481425. Note that the first 3 decimals are identical.

Adding to 421864 its reverse (468124), we get a palindrome (889988).

The spelling of 421864 in words is "four hundred twenty-one thousand, eight hundred sixty-four".