3938840 has 32 divisors (see below), whose sum is σ = 9018000. Its totient is φ = 1547904.

The previous prime is 3938839. The next prime is 3938897. The reversal of 3938840 is 488393.

It is a super-3 number, since 3×3938840³ (a number of 21 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3938840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1526 + ... + 3194.

Almost surely, 2^3938840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3938840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4509000).

3938840 is an abundant number, since it is smaller than the sum of its proper divisors (5079160).

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

3938840 is a wasteful number, since it uses less digits than its factorization.

3938840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739 (or 1735 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 3938840 is about 1984.6511028390. The cubic root of 3938840 is about 157.9269009719.

The spelling of 3938840 in words is "three million, nine hundred thirty-eight thousand, eight hundred forty".