7889940 has 96 divisors (see below), whose sum is σ = 25872000. Its totient is φ = 1990656.

The previous prime is 7889929. The next prime is 7889953. The reversal of 7889940 is 499887.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9876 + ... + 10644.

It is an arithmetic number, because the mean of its divisors is an integer number (269500).

Almost surely, 2^7889940 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 7889940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12936000).

7889940 is an abundant number, since it is smaller than the sum of its proper divisors (17982060).

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

7889940 is a wasteful number, since it uses less digits than its factorization.

7889940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806 (or 798 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 7889940 is about 2808.9037007345. The cubic root of 7889940 is about 199.0785949155.

The spelling of 7889940 in words is "seven million, eight hundred eighty-nine thousand, nine hundred forty".