7971885 has 16 divisors (see below), whose sum is σ = 14172480. Its totient is φ = 4251600.

The previous prime is 7971881. The next prime is 7971911. The reversal of 7971885 is 5881797.

It is not a de Polignac number, because 7971885 - 2² = 7971881 is a prime.

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

7971885 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7971885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7971881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29391 + ... + 29660.

It is an arithmetic number, because the mean of its divisors is an integer number (885780).

Almost surely, 2^7971885 is an apocalyptic number.

It is an amenable number.

7971885 is a deficient number, since it is larger than the sum of its proper divisors (6200595).

7971885 is a wasteful number, since it uses less digits than its factorization.

7971885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59065 (or 59059 counting only the distinct ones).

The product of its digits is 141120, while the sum is 45.

The square root of 7971885 is about 2823.4526735896. The cubic root of 7971885 is about 199.7654333333.

The spelling of 7971885 in words is "seven million, nine hundred seventy-one thousand, eight hundred eighty-five".