7928869 has 4 divisors (see below), whose sum is σ = 8538796. Its totient is φ = 7318944.

The previous prime is 7928863. The next prime is 7928881. The reversal of 7928869 is 9688297.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3560769 + 4368100 = 1887^2 + 2090^2 .

It is a cyclic number.

It is not a de Polignac number, because 7928869 - 2¹³ = 7920677 is a prime.

It is a super-2 number, since 2×7928869² = 125733927238322, which contains 22 as substring.

It is a d-powerful number, because it can be written as 7⁸ + 9² + 2 + 8 + 8⁷ + 6⁵ + 9⁵ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7928863) 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, 304944 + ... + 304969.

It is an arithmetic number, because the mean of its divisors is an integer number (2134699).

Almost surely, 2^7928869 is an apocalyptic number.

It is an amenable number.

7928869 is a deficient number, since it is larger than the sum of its proper divisors (609927).

7928869 is a wasteful number, since it uses less digits than its factorization.

7928869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609926.

The product of its digits is 435456, while the sum is 49.

The square root of 7928869 is about 2815.8247459670. The cubic root of 7928869 is about 199.4054761246.

The spelling of 7928869 in words is "seven million, nine hundred twenty-eight thousand, eight hundred sixty-nine".