80405639 has 2 divisors, whose sum is σ = 80405640. Its totient is φ = 80405638.

The previous prime is 80405623. The next prime is 80405651. The reversal of 80405639 is 93650408.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80405639 - 2⁴ = 80405623 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 80405599 and 80405608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80405659) 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, 40202819 + 40202820.

It is an arithmetic number, because the mean of its divisors is an integer number (40202820).

Almost surely, 2^80405639 is an apocalyptic number.

80405639 is a deficient number, since it is larger than the sum of its proper divisors (1).

80405639 is an equidigital number, since it uses as much as digits as its factorization.

80405639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 80405639 is about 8966.9191476226. The cubic root of 80405639 is about 431.6139795135.

The spelling of 80405639 in words is "eighty million, four hundred five thousand, six hundred thirty-nine".