8438840 has 32 divisors (see below), whose sum is σ = 19165680. Its totient is φ = 3343872.

The previous prime is 8438813. The next prime is 8438863. The reversal of 8438840 is 488348.

It is a self number, because there is not a number n which added to its sum of digits gives 8438840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3587 + ... + 5453.

Almost surely, 2^8438840 is an apocalyptic number.

It is an amenable number.

8438840 is an abundant number, since it is smaller than the sum of its proper divisors (10726840).

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

8438840 is a wasteful number, since it uses less digits than its factorization.

With its successor (8438841) it forms an eRAP, since the sums of their prime factors are consecutive (1991 and 1992).

8438840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991 (or 1987 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 8438840 is about 2904.9681581732. The cubic root of 8438840 is about 203.5920979174.

The spelling of 8438840 in words is "eight million, four hundred thirty-eight thousand, eight hundred forty".