7409921 has 2 divisors, whose sum is σ = 7409922. Its totient is φ = 7409920.

The previous prime is 7409917. The next prime is 7409947. The reversal of 7409921 is 1299047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3841600 + 3568321 = 1960^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 7409921 - 2² = 7409917 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 (7409911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3704960 + 3704961.

It is an arithmetic number, because the mean of its divisors is an integer number (3704961).

Almost surely, 2^7409921 is an apocalyptic number.

It is an amenable number.

7409921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7409921 is an equidigital number, since it uses as much as digits as its factorization.

7409921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 7409921 is about 2722.1170070370. The cubic root of 7409921 is about 194.9565627553.

The spelling of 7409921 in words is "seven million, four hundred nine thousand, nine hundred twenty-one".