7987940 has 24 divisors (see below), whose sum is σ = 16837632. Its totient is φ = 3183200.

The previous prime is 7987921. The next prime is 7987957. The reversal of 7987940 is 497897.

It is a junction number, because it is equal to n+sod(n) for n = 7987891 and 7987900.

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 7 ways as a sum of consecutive naturals, for example, 6365 + ... + 7515.

It is an arithmetic number, because the mean of its divisors is an integer number (701568).

Almost surely, 2^7987940 is an apocalyptic number.

It is an amenable number.

7987940 is an abundant number, since it is smaller than the sum of its proper divisors (8849692).

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

7987940 is a wasteful number, since it uses less digits than its factorization.

7987940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507 (or 1505 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 7987940 is about 2826.2943937248. The cubic root of 7987940 is about 199.8994494564.

The spelling of 7987940 in words is "seven million, nine hundred eighty-seven thousand, nine hundred forty".