421145440 has 96 divisors (see below), whose sum is σ = 1043624736. Its totient is φ = 160419840.

The previous prime is 421145429. The next prime is 421145441. The reversal of 421145440 is 44541124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421145441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281334 + ... + 282826.

It is an arithmetic number, because the mean of its divisors is an integer number (10871091).

Almost surely, 2^421145440 is an apocalyptic number.

421145440 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 421145440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (521812368).

421145440 is an abundant number, since it is smaller than the sum of its proper divisors (622479296).

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

421145440 is a wasteful number, since it uses less digits than its factorization.

421145440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592 (or 1584 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 421145440 is about 20521.8283785826. The cubic root of 421145440 is about 749.5674186940.

Adding to 421145440 its reverse (44541124), we get a palindrome (465686564).

The spelling of 421145440 in words is "four hundred twenty-one million, one hundred forty-five thousand, four hundred forty".