7456921 has 2 divisors, whose sum is σ = 7456922. Its totient is φ = 7456920.

The previous prime is 7456909. The next prime is 7456963. The reversal of 7456921 is 1296547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5929225 + 1527696 = 2435^2 + 1236^2 .

It is a cyclic number.

It is not a de Polignac number, because 7456921 - 2¹⁹ = 6932633 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (7456901) 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, 3728460 + 3728461.

It is an arithmetic number, because the mean of its divisors is an integer number (3728461).

Almost surely, 2^7456921 is an apocalyptic number.

It is an amenable number.

7456921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7456921 is an equidigital number, since it uses as much as digits as its factorization.

7456921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 7456921 is about 2730.7363475810. The cubic root of 7456921 is about 195.3678875789.

The spelling of 7456921 in words is "seven million, four hundred fifty-six thousand, nine hundred twenty-one".