862844947 has 2 divisors, whose sum is σ = 862844948. Its totient is φ = 862844946.

The previous prime is 862844893. The next prime is 862844953. The reversal of 862844947 is 749448268.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-862844947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 862844894 and 862844903.

It is not a weakly prime, because it can be changed into another prime (862844987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431422473 + 431422474.

It is an arithmetic number, because the mean of its divisors is an integer number (431422474).

Almost surely, 2^862844947 is an apocalyptic number.

862844947 is a deficient number, since it is larger than the sum of its proper divisors (1).

862844947 is an equidigital number, since it uses as much as digits as its factorization.

862844947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3096576, while the sum is 52.

The square root of 862844947 is about 29374.2224918380. Note that the first 3 decimals coincide. The cubic root of 862844947 is about 952.0160131213.

The spelling of 862844947 in words is "eight hundred sixty-two million, eight hundred forty-four thousand, nine hundred forty-seven".