8421400 has 96 divisors (see below), whose sum is σ = 21873600. Its totient is φ = 2995200.

The previous prime is 8421251. The next prime is 8421403. The reversal of 8421400 is 41248.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106561 + ... + 106639.

It is an arithmetic number, because the mean of its divisors is an integer number (227850).

Almost surely, 2^8421400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8421400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10936800).

8421400 is an abundant number, since it is smaller than the sum of its proper divisors (13452200).

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

8421400 is a wasteful number, since it uses less digits than its factorization.

8421400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 8421400 is about 2901.9648516135. The cubic root of 8421400 is about 203.4517510229.

Adding to 8421400 its reverse (41248), we get a palindrome (8462648).

The spelling of 8421400 in words is "eight million, four hundred twenty-one thousand, four hundred".