8421402320 has 40 divisors (see below), whose sum is σ = 19617438600. Its totient is φ = 3362078720.

The previous prime is 8421402317. The next prime is 8421402323. The reversal of 8421402320 is 232041248.

It is an interprime number because it is at equal distance from previous prime (8421402317) and next prime (8421402323).

It can be written as a sum of positive squares in 4 ways, for example, as 32307856 + 8389094464 = 5684^2 + 91592^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 8421402320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421402323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59345 + ... + 142704.

It is an arithmetic number, because the mean of its divisors is an integer number (490435965).

Almost surely, 2^8421402320 is an apocalyptic number.

8421402320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8421402320 is an abundant number, since it is smaller than the sum of its proper divisors (11196036280).

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

8421402320 is a wasteful number, since it uses less digits than its factorization.

8421402320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202583 (or 202577 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 8421402320 is about 91768.1988490566. The cubic root of 8421402320 is about 2034.5176970575.

Adding to 8421402320 its reverse (232041248), we get a palindrome (8653443568).

The spelling of 8421402320 in words is "eight billion, four hundred twenty-one million, four hundred two thousand, three hundred twenty".