8430640 has 40 divisors (see below), whose sum is σ = 20757600. Its totient is φ = 3173376.

The previous prime is 8430613. The next prime is 8430649. The reversal of 8430640 is 460348.

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

It is not an unprimeable number, because it can be changed into a prime (8430649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1740 + ... + 4459.

It is an arithmetic number, because the mean of its divisors is an integer number (518940).

Almost surely, 2^8430640 is an apocalyptic number.

8430640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8430640 is an abundant number, since it is smaller than the sum of its proper divisors (12326960).

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

8430640 is a wasteful number, since it uses less digits than its factorization.

8430640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6229 (or 6223 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 8430640 is about 2903.5564399543. The cubic root of 8430640 is about 203.5261332339.

Adding to 8430640 its reverse (460348), we get a palindrome (8890988).

The spelling of 8430640 in words is "eight million, four hundred thirty thousand, six hundred forty".