7871840 has 24 divisors (see below), whose sum is σ = 18597600. Its totient is φ = 3148672.

The previous prime is 7871837. The next prime is 7871863. The reversal of 7871840 is 481787.

It is a self number, because there is not a number n which added to its sum of digits gives 7871840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24440 + ... + 24759.

It is an arithmetic number, because the mean of its divisors is an integer number (774900).

Almost surely, 2^7871840 is an apocalyptic number.

It is an amenable number.

7871840 is an abundant number, since it is smaller than the sum of its proper divisors (10725760).

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

7871840 is a wasteful number, since it uses less digits than its factorization.

7871840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49214 (or 49206 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 7871840 is about 2805.6799532377. The cubic root of 7871840 is about 198.9262455737.

The spelling of 7871840 in words is "seven million, eight hundred seventy-one thousand, eight hundred forty".