7852121 has 4 divisors (see below), whose sum is σ = 7882932. Its totient is φ = 7821312.

The previous prime is 7852093. The next prime is 7852123. The reversal of 7852121 is 1212587.

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 5175625 + 2676496 = 2275^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 7852121 - 2⁶ = 7852057 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7852123) 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, 15020 + ... + 15533.

It is an arithmetic number, because the mean of its divisors is an integer number (1970733).

Almost surely, 2^7852121 is an apocalyptic number.

It is an amenable number.

7852121 is a deficient number, since it is larger than the sum of its proper divisors (30811).

7852121 is a wasteful number, since it uses less digits than its factorization.

7852121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30810.

The product of its digits is 1120, while the sum is 26.

The square root of 7852121 is about 2802.1636283415. The cubic root of 7852121 is about 198.7600029247.

The spelling of 7852121 in words is "seven million, eight hundred fifty-two thousand, one hundred twenty-one".