4247819 has 2 divisors, whose sum is σ = 4247820. Its totient is φ = 4247818.

The previous prime is 4247809. The next prime is 4247821. The reversal of 4247819 is 9187424.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4247819 is a prime.

It is a super-2 number, since 2×4247819² = 36087932513522, which contains 22 as substring.

Together with 4247821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4247809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2123909 + 2123910.

It is an arithmetic number, because the mean of its divisors is an integer number (2123910).

Almost surely, 2^4247819 is an apocalyptic number.

4247819 is a deficient number, since it is larger than the sum of its proper divisors (1).

4247819 is an equidigital number, since it uses as much as digits as its factorization.

4247819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 4247819 is about 2061.0237747294. The cubic root of 4247819 is about 161.9528771136.

The spelling of 4247819 in words is "four million, two hundred forty-seven thousand, eight hundred nineteen".