842326409 has 2 divisors, whose sum is σ = 842326410. Its totient is φ = 842326408.

The previous prime is 842326399. The next prime is 842326543. The reversal of 842326409 is 904623248.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 742726009 + 99600400 = 27253^2 + 9980^2 .

It is a cyclic number.

It is not a de Polignac number, because 842326409 - 2⁸ = 842326153 is a prime.

It is not a weakly prime, because it can be changed into another prime (842326109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421163204 + 421163205.

It is an arithmetic number, because the mean of its divisors is an integer number (421163205).

Almost surely, 2^842326409 is an apocalyptic number.

It is an amenable number.

842326409 is a deficient number, since it is larger than the sum of its proper divisors (1).

842326409 is an equidigital number, since it uses as much as digits as its factorization.

842326409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 842326409 is about 29022.8601106094. The cubic root of 842326409 is about 944.4090475833.

The spelling of 842326409 in words is "eight hundred forty-two million, three hundred twenty-six thousand, four hundred nine".