7871955 has 64 divisors (see below), whose sum is σ = 15912960. Its totient is φ = 3234816.

The previous prime is 7871953. The next prime is 7871971. The reversal of 7871955 is 5591787.

7871955 = 140² + 141² + ... + 297².

It is not a de Polignac number, because 7871955 - 2¹ = 7871953 is a prime.

Its product of digits (88200) is a multiple of the sum of its prime divisors (180).

7871955 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7871953) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 99606 + ... + 99684.

It is an arithmetic number, because the mean of its divisors is an integer number (248640).

Almost surely, 2^7871955 is an apocalyptic number.

7871955 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

7871955 is a wasteful number, since it uses less digits than its factorization.

7871955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180.

The product of its digits is 88200, while the sum is 42.

The square root of 7871955 is about 2805.7004473037. The cubic root of 7871955 is about 198.9272142759.

The spelling of 7871955 in words is "seven million, eight hundred seventy-one thousand, nine hundred fifty-five".