421400 has 72 divisors (see below), whose sum is σ = 1166220. Its totient is φ = 141120.

The previous prime is 421397. The next prime is 421409. The reversal of 421400 is 4124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421409) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9779 + ... + 9821.

2⁴²¹⁴⁰⁰ is an apocalyptic number.

421400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (583110).

421400 is an abundant number, since it is smaller than the sum of its proper divisors (744820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421400 is a wasteful number, since it uses less digits than its factorization.

421400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 421400 is about 649.1532946847. The cubic root of 421400 is about 74.9718412810.

Adding to 421400 its reverse (4124), we get a palindrome (425524).

The spelling of 421400 in words is "four hundred twenty-one thousand, four hundred", and thus it is an iban number.