7938121 has 2 divisors, whose sum is σ = 7938122. Its totient is φ = 7938120.

The previous prime is 7938109. The next prime is 7938127. The reversal of 7938121 is 1218397.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5569600 + 2368521 = 2360^2 + 1539^2 .

It is a cyclic number.

It is not a de Polignac number, because 7938121 - 2⁵ = 7938089 is a prime.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 7938121 parts by 3984 straight cuts.

It is not a weakly prime, because it can be changed into another prime (7938127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3969060 + 3969061.

It is an arithmetic number, because the mean of its divisors is an integer number (3969061).

Almost surely, 2^7938121 is an apocalyptic number.

It is an amenable number.

7938121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7938121 is an equidigital number, since it uses as much as digits as its factorization.

7938121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 7938121 is about 2817.4671249191. The cubic root of 7938121 is about 199.4830064063.

The spelling of 7938121 in words is "seven million, nine hundred thirty-eight thousand, one hundred twenty-one".