8400247 has 2 divisors, whose sum is σ = 8400248. Its totient is φ = 8400246.

The previous prime is 8400233. The next prime is 8400251. The reversal of 8400247 is 7420048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8400247 - 2¹¹ = 8398199 is a prime.

It is a super-2 number, since 2×8400247² = 141128299322018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8400047) 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, 4200123 + 4200124.

It is an arithmetic number, because the mean of its divisors is an integer number (4200124).

Almost surely, 2^8400247 is an apocalyptic number.

8400247 is a deficient number, since it is larger than the sum of its proper divisors (1).

8400247 is an equidigital number, since it uses as much as digits as its factorization.

8400247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 8400247 is about 2898.3179604729. The cubic root of 8400247 is about 203.2812638030.

The spelling of 8400247 in words is "eight million, four hundred thousand, two hundred forty-seven".