7979840 has 56 divisors (see below), whose sum is σ = 20738592. Its totient is φ = 2900480.

The previous prime is 7979833. The next prime is 7979857. The reversal of 7979840 is 489797.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 7979791 and 7979800.

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, 2387 + ... + 4653.

It is an arithmetic number, because the mean of its divisors is an integer number (370332).

Almost surely, 2^7979840 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 7979840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10369296).

7979840 is an abundant number, since it is smaller than the sum of its proper divisors (12758752).

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

7979840 is a wasteful number, since it uses less digits than its factorization.

7979840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2295 (or 2285 counting only the distinct ones).

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

The square root of 7979840 is about 2824.8610585301. The cubic root of 7979840 is about 199.8318586821.

The spelling of 7979840 in words is "seven million, nine hundred seventy-nine thousand, eight hundred forty".