825402839 has 2 divisors, whose sum is σ = 825402840. Its totient is φ = 825402838.

The previous prime is 825402833. The next prime is 825402841. The reversal of 825402839 is 938204528.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-825402839 is a prime.

It is a Sophie Germain prime.

Together with 825402841, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 825402796 and 825402805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825402833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412701419 + 412701420.

It is an arithmetic number, because the mean of its divisors is an integer number (412701420).

Almost surely, 2^825402839 is an apocalyptic number.

825402839 is a deficient number, since it is larger than the sum of its proper divisors (1).

825402839 is an equidigital number, since it uses as much as digits as its factorization.

825402839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 825402839 is about 28729.8249037477. The cubic root of 825402839 is about 938.0413566446.

The spelling of 825402839 in words is "eight hundred twenty-five million, four hundred two thousand, eight hundred thirty-nine".