7921969 has 4 divisors (see below), whose sum is σ = 8642160. Its totient is φ = 7201780.

The previous prime is 7921943. The next prime is 7921981. The reversal of 7921969 is 9691297.

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.

It is a cyclic number.

It is not a de Polignac number, because 7921969 - 2⁹ = 7921457 is a prime.

It is a super-2 number, since 2×7921969² = 125515185673922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7921909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360079 + ... + 360100.

It is an arithmetic number, because the mean of its divisors is an integer number (2160540).

Almost surely, 2^7921969 is an apocalyptic number.

It is an amenable number.

7921969 is a deficient number, since it is larger than the sum of its proper divisors (720191).

7921969 is a wasteful number, since it uses less digits than its factorization.

7921969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720190.

The product of its digits is 61236, while the sum is 43.

The square root of 7921969 is about 2814.5992609961. The cubic root of 7921969 is about 199.3476159558.

The spelling of 7921969 in words is "seven million, nine hundred twenty-one thousand, nine hundred sixty-nine".