7390921 has 2 divisors, whose sum is σ = 7390922. Its totient is φ = 7390920.

The previous prime is 7390913. The next prime is 7390931. The reversal of 7390921 is 1290937.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4020025 + 3370896 = 2005^2 + 1836^2 .

It is an emirp because it is prime and its reverse (1290937) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7390921 - 2³ = 7390913 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7390931) 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 as a sum of consecutive naturals, namely, 3695460 + 3695461.

It is an arithmetic number, because the mean of its divisors is an integer number (3695461).

Almost surely, 2^7390921 is an apocalyptic number.

It is an amenable number.

7390921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7390921 is an equidigital number, since it uses as much as digits as its factorization.

7390921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 7390921 is about 2718.6248361994. The cubic root of 7390921 is about 194.7897888133.

The spelling of 7390921 in words is "seven million, three hundred ninety thousand, nine hundred twenty-one".