7388921 has 2 divisors, whose sum is σ = 7388922. Its totient is φ = 7388920.

The previous prime is 7388893. The next prime is 7388923. The reversal of 7388921 is 1298837.

7388921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4682896 + 2706025 = 2164^2 + 1645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7388921 is a prime.

It is a Sophie Germain prime.

Together with 7388923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7388923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3694460 + 3694461.

It is an arithmetic number, because the mean of its divisors is an integer number (3694461).

Almost surely, 2^7388921 is an apocalyptic number.

It is an amenable number.

7388921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7388921 is an equidigital number, since it uses as much as digits as its factorization.

7388921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 7388921 is about 2718.2569782859. The cubic root of 7388921 is about 194.7722170419.

The spelling of 7388921 in words is "seven million, three hundred eighty-eight thousand, nine hundred twenty-one".