405809039 has 2 divisors, whose sum is σ = 405809040. Its totient is φ = 405809038.

The previous prime is 405809029. The next prime is 405809101. The reversal of 405809039 is 930908504.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405809039 is a prime.

It is a super-2 number, since 2×405809039² = 329361952268207042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 405808993 and 405809011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405809009) 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, 202904519 + 202904520.

It is an arithmetic number, because the mean of its divisors is an integer number (202904520).

Almost surely, 2^405809039 is an apocalyptic number.

405809039 is a deficient number, since it is larger than the sum of its proper divisors (1).

405809039 is an equidigital number, since it uses as much as digits as its factorization.

405809039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 405809039 is about 20144.7025046289. The cubic root of 405809039 is about 740.3559518366.

The spelling of 405809039 in words is "four hundred five million, eight hundred nine thousand, thirty-nine".