405422839 has 2 divisors, whose sum is σ = 405422840. Its totient is φ = 405422838.

The previous prime is 405422821. The next prime is 405422881. The reversal of 405422839 is 938224504.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405422839 - 2¹¹ = 405420791 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 405422798 and 405422807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405422819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202711419 + 202711420.

It is an arithmetic number, because the mean of its divisors is an integer number (202711420).

Almost surely, 2^405422839 is an apocalyptic number.

405422839 is a deficient number, since it is larger than the sum of its proper divisors (1).

405422839 is an equidigital number, since it uses as much as digits as its factorization.

405422839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 405422839 is about 20135.1145762819. The cubic root of 405422839 is about 740.1210168530.

The spelling of 405422839 in words is "four hundred five million, four hundred twenty-two thousand, eight hundred thirty-nine".