8238640 has 20 divisors (see below), whose sum is σ = 19155024. Its totient is φ = 3295424.

The previous prime is 8238619. The next prime is 8238683. The reversal of 8238640 is 468328.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51412 + ... + 51571.

Almost surely, 2^8238640 is an apocalyptic number.

8238640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8238640 is an abundant number, since it is smaller than the sum of its proper divisors (10916384).

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

8238640 is a wasteful number, since it uses less digits than its factorization.

8238640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102996 (or 102990 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 8238640 is about 2870.3031198812. The cubic root of 8238640 is about 201.9692140123.

The spelling of 8238640 in words is "eight million, two hundred thirty-eight thousand, six hundred forty".