7830505 has 4 divisors (see below), whose sum is σ = 9396612. Its totient is φ = 6264400.

The previous prime is 7830503. The next prime is 7830521. The reversal of 7830505 is 5050387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5050387 = 389 ⋅12983.

It can be written as a sum of positive squares in 2 ways, for example, as 2223081 + 5607424 = 1491^2 + 2368^2 .

It is not a de Polignac number, because 7830505 - 2¹ = 7830503 is a prime.

It is a super-2 number, since 2×7830505² = 122633617110050, which contains 22 as substring.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7830503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783046 + ... + 783055.

It is an arithmetic number, because the mean of its divisors is an integer number (2349153).

Almost surely, 2^7830505 is an apocalyptic number.

It is an amenable number.

7830505 is a deficient number, since it is larger than the sum of its proper divisors (1566107).

7830505 is a wasteful number, since it uses less digits than its factorization.

7830505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566106.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 7830505 is about 2798.3039506101. The cubic root of 7830505 is about 198.5774473765.

The spelling of 7830505 in words is "seven million, eight hundred thirty thousand, five hundred five".