7921247 has 2 divisors, whose sum is σ = 7921248. Its totient is φ = 7921246.

The previous prime is 7921237. The next prime is 7921259. The reversal of 7921247 is 7421297.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7921247 - 2¹⁴ = 7904863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7921237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3960623 + 3960624.

It is an arithmetic number, because the mean of its divisors is an integer number (3960624).

Almost surely, 2^7921247 is an apocalyptic number.

7921247 is a deficient number, since it is larger than the sum of its proper divisors (1).

7921247 is an equidigital number, since it uses as much as digits as its factorization.

7921247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 7921247 is about 2814.4709982517. The cubic root of 7921247 is about 199.3415596605.

The spelling of 7921247 in words is "seven million, nine hundred twenty-one thousand, two hundred forty-seven".