7920917 has 4 divisors (see below), whose sum is σ = 7927020. Its totient is φ = 7914816.

The previous prime is 7920893. The next prime is 7920949. The reversal of 7920917 is 7190297.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7190297 = 1151 ⋅6247.

It can be written as a sum of positive squares in 2 ways, for example, as 4363921 + 3556996 = 2089^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 7920917 - 2¹⁰ = 7919893 is a prime.

It is a super-2 number, since 2×7920917² = 125481852241778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7920217) 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, 242 + ... + 3987.

It is an arithmetic number, because the mean of its divisors is an integer number (1981755).

Almost surely, 2^7920917 is an apocalyptic number.

It is an amenable number.

7920917 is a deficient number, since it is larger than the sum of its proper divisors (6103).

7920917 is a wasteful number, since it uses less digits than its factorization.

7920917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6102.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 7920917 is about 2814.4123720592. The cubic root of 7920917 is about 199.3387914251.

The spelling of 7920917 in words is "seven million, nine hundred twenty thousand, nine hundred seventeen".