7981897 has 16 divisors (see below), whose sum is σ = 10386432. Its totient is φ = 5947920.

The previous prime is 7981889. The next prime is 7981907.

7981897 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 7981897 - 2³ = 7981889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7981897.

It is not an unprimeable number, because it can be changed into a prime (7981807) 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 15 ways as a sum of consecutive naturals, for example, 483 + ... + 4024.

It is an arithmetic number, because the mean of its divisors is an integer number (649152).

Almost surely, 2^7981897 is an apocalyptic number.

7981897 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

7981897 is a deficient number, since it is larger than the sum of its proper divisors (2404535).

7981897 is a wasteful number, since it uses less digits than its factorization.

7981897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4548.

The product of its digits is 254016, while the sum is 49.

The square root of 7981897 is about 2825.2251237733. The cubic root of 7981897 is about 199.8490277322.

The spelling of 7981897 in words is "seven million, nine hundred eighty-one thousand, eight hundred ninety-seven".