421403400 has 144 divisors (see below), whose sum is σ = 1543941360. Its totient is φ = 102153600.

The previous prime is 421403357. The next prime is 421403417. The reversal of 421403400 is 4304124.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9159 + ... + 30441.

It is an arithmetic number, because the mean of its divisors is an integer number (10721815).

Almost surely, 2^421403400 is an apocalyptic number.

421403400 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 421403400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (771970680).

421403400 is an abundant number, since it is smaller than the sum of its proper divisors (1122537960).

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

421403400 is a wasteful number, since it uses less digits than its factorization.

421403400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21316 (or 21304 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 421403400 is about 20528.1124314926. The cubic root of 421403400 is about 749.7204291331.

Adding to 421403400 its reverse (4304124), we get a palindrome (425707524).

The spelling of 421403400 in words is "four hundred twenty-one million, four hundred three thousand, four hundred".