7906121 has 4 divisors (see below), whose sum is σ = 7914132. Its totient is φ = 7898112.

The previous prime is 7906117. The next prime is 7906127. The reversal of 7906121 is 1216097.

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: 1216097 = 191 ⋅6367.

It can be written as a sum of positive squares in 2 ways, for example, as 2449225 + 5456896 = 1565^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 7906121 - 2² = 7906117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7906127) 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, 2276 + ... + 4581.

It is an arithmetic number, because the mean of its divisors is an integer number (1978533).

Almost surely, 2^7906121 is an apocalyptic number.

It is an amenable number.

7906121 is a deficient number, since it is larger than the sum of its proper divisors (8011).

7906121 is a wasteful number, since it uses less digits than its factorization.

7906121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8010.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 7906121 is about 2811.7825307089. The cubic root of 7906121 is about 199.2145947302.

The spelling of 7906121 in words is "seven million, nine hundred six thousand, one hundred twenty-one".