7855140 has 48 divisors (see below), whose sum is σ = 22256640. Its totient is φ = 2069760.

The previous prime is 7855109. The next prime is 7855163. The reversal of 7855140 is 415587.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7855098 and 7855107.

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 15 ways as a sum of consecutive naturals, for example, 4605 + ... + 6075.

It is an arithmetic number, because the mean of its divisors is an integer number (463680).

Almost surely, 2^7855140 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 7855140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11128320).

7855140 is an abundant number, since it is smaller than the sum of its proper divisors (14401500).

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

7855140 is a wasteful number, since it uses less digits than its factorization.

7855140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572 (or 1570 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 7855140 is about 2802.7022674555. The cubic root of 7855140 is about 198.7854728821.

The spelling of 7855140 in words is "seven million, eight hundred fifty-five thousand, one hundred forty".