8447429 has 2 divisors, whose sum is σ = 8447430. Its totient is φ = 8447428.

The previous prime is 8447423. The next prime is 8447431. The reversal of 8447429 is 9247448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6770404 + 1677025 = 2602^2 + 1295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8447429 is a prime.

It is a Sophie Germain prime.

Together with 8447431, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8447392 and 8447401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8447423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4223714 + 4223715.

It is an arithmetic number, because the mean of its divisors is an integer number (4223715).

Almost surely, 2^8447429 is an apocalyptic number.

It is an amenable number.

8447429 is a deficient number, since it is larger than the sum of its proper divisors (1).

8447429 is an equidigital number, since it uses as much as digits as its factorization.

8447429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 38.

The square root of 8447429 is about 2906.4461116628. The cubic root of 8447429 is about 203.6611460966.

The spelling of 8447429 in words is "eight million, four hundred forty-seven thousand, four hundred twenty-nine".