823143427 has 2 divisors, whose sum is σ = 823143428. Its totient is φ = 823143426.

The previous prime is 823143407. The next prime is 823143437. The reversal of 823143427 is 724341328.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-823143427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 823143392 and 823143401.

It is not a weakly prime, because it can be changed into another prime (823143407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411571713 + 411571714.

It is an arithmetic number, because the mean of its divisors is an integer number (411571714).

Almost surely, 2^823143427 is an apocalyptic number.

823143427 is a deficient number, since it is larger than the sum of its proper divisors (1).

823143427 is an equidigital number, since it uses as much as digits as its factorization.

823143427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 34.

The square root of 823143427 is about 28690.4762421261. The cubic root of 823143427 is about 937.1846603317.

The spelling of 823143427 in words is "eight hundred twenty-three million, one hundred forty-three thousand, four hundred twenty-seven".