829439987 has 2 divisors, whose sum is σ = 829439988. Its totient is φ = 829439986.

The previous prime is 829439899. The next prime is 829440037. The reversal of 829439987 is 789934928.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 829439987 - 2¹² = 829435891 is a prime.

It is not a weakly prime, because it can be changed into another prime (829439587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414719993 + 414719994.

It is an arithmetic number, because the mean of its divisors is an integer number (414719994).

Almost surely, 2^829439987 is an apocalyptic number.

829439987 is a deficient number, since it is larger than the sum of its proper divisors (1).

829439987 is an equidigital number, since it uses as much as digits as its factorization.

829439987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 59.

The square root of 829439987 is about 28799.9997743056. Note that the first 3 decimals coincide. The cubic root of 829439987 is about 939.5682289718.

The spelling of 829439987 in words is "eight hundred twenty-nine million, four hundred thirty-nine thousand, nine hundred eighty-seven".