7981969 has 4 divisors (see below), whose sum is σ = 7988544. Its totient is φ = 7975396.

The previous prime is 7981949. The next prime is 7981999. The reversal of 7981969 is 9691897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7981969 - 2⁵ = 7981937 is a prime.

It is a super-2 number, since 2×7981969² = 127423658233922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7981949) 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 3 ways as a sum of consecutive naturals, for example, 877 + ... + 4090.

It is an arithmetic number, because the mean of its divisors is an integer number (1997136).

Almost surely, 2^7981969 is an apocalyptic number.

It is an amenable number.

7981969 is a deficient number, since it is larger than the sum of its proper divisors (6575).

7981969 is a wasteful number, since it uses less digits than its factorization.

7981969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6574.

The product of its digits is 244944, while the sum is 49.

The square root of 7981969 is about 2825.2378660920. The cubic root of 7981969 is about 199.8496286373.

The spelling of 7981969 in words is "seven million, nine hundred eighty-one thousand, nine hundred sixty-nine".