8400047 has 2 divisors, whose sum is σ = 8400048. Its totient is φ = 8400046.

The previous prime is 8400043. The next prime is 8400059. The reversal of 8400047 is 7400048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8400047 - 2² = 8400043 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8399995 and 8400031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8400043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4200023 + 4200024.

It is an arithmetic number, because the mean of its divisors is an integer number (4200024).

Almost surely, 2^8400047 is an apocalyptic number.

8400047 is a deficient number, since it is larger than the sum of its proper divisors (1).

8400047 is an equidigital number, since it uses as much as digits as its factorization.

8400047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 8400047 is about 2898.2834574969. The cubic root of 8400047 is about 203.2796504942.

Subtracting from 8400047 its reverse (7400048), we obtain a palindrome (999999).

The spelling of 8400047 in words is "eight million, four hundred thousand, forty-seven".