9138840 has 32 divisors (see below), whose sum is σ = 27416880. Its totient is φ = 2436992.

The previous prime is 9138839. The next prime is 9138847. The reversal of 9138840 is 488319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9138847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37959 + ... + 38198.

Almost surely, 2^9138840 is an apocalyptic number.

It is an amenable number.

9138840 is an abundant number, since it is smaller than the sum of its proper divisors (18278040).

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

9138840 is a wasteful number, since it uses less digits than its factorization.

9138840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76171 (or 76167 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 9138840 is about 3023.0514385303. The cubic root of 9138840 is about 209.0725540398.

The spelling of 9138840 in words is "nine million, one hundred thirty-eight thousand, eight hundred forty".