421004400 has 240 divisors, whose sum is σ = 1420742400. Its totient is φ = 106444800.

The previous prime is 421004399. The next prime is 421004431. The reversal of 421004400 is 4400124.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 421004400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2115501 + ... + 2115699.

It is an arithmetic number, because the mean of its divisors is an integer number (5919760).

Almost surely, 2^421004400 is an apocalyptic number.

421004400 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 421004400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (710371200).

421004400 is an abundant number, since it is smaller than the sum of its proper divisors (999738000).

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

421004400 is a wasteful number, since it uses less digits than its factorization.

421004400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 421004400 is about 20518.3917498424. The cubic root of 421004400 is about 749.4837335958.

Adding to 421004400 its reverse (4400124), we get a palindrome (425404524).

The spelling of 421004400 in words is "four hundred twenty-one million, four thousand, four hundred".