402421344 has 96 divisors (see below), whose sum is σ = 1147023360. Its totient is φ = 122798592.

The previous prime is 402421343. The next prime is 402421367. The reversal of 402421344 is 443124204.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402421343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157227 + ... + 159765.

It is an arithmetic number, because the mean of its divisors is an integer number (11948160).

Almost surely, 2^402421344 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 402421344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (573511680).

402421344 is an abundant number, since it is smaller than the sum of its proper divisors (744602016).

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

402421344 is a wasteful number, since it uses less digits than its factorization.

402421344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692 (or 2684 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 402421344 is about 20060.4422683051. The cubic root of 402421344 is about 738.2900278240.

Adding to 402421344 its reverse (443124204), we get a palindrome (845545548).

The spelling of 402421344 in words is "four hundred two million, four hundred twenty-one thousand, three hundred forty-four".