7938940 has 12 divisors (see below), whose sum is σ = 16671816. Its totient is φ = 3175568.

The previous prime is 7938929. The next prime is 7938977. The reversal of 7938940 is 498397.

It is a junction number, because it is equal to n+sod(n) for n = 7938893 and 7938902.

It is a congruent number.

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, 198454 + ... + 198493.

It is an arithmetic number, because the mean of its divisors is an integer number (1389318).

Almost surely, 2^7938940 is an apocalyptic number.

It is an amenable number.

7938940 is an abundant number, since it is smaller than the sum of its proper divisors (8732876).

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

7938940 is a wasteful number, since it uses less digits than its factorization.

7938940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396956 (or 396954 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 7938940 is about 2817.6124644812. The cubic root of 7938940 is about 199.4898665925.

The spelling of 7938940 in words is "seven million, nine hundred thirty-eight thousand, nine hundred forty".