405605947 has 2 divisors, whose sum is σ = 405605948. Its totient is φ = 405605946.

The previous prime is 405605923. The next prime is 405605969. The reversal of 405605947 is 749506504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 405605947 - 2⁷ = 405605819 is a prime.

It is not a weakly prime, because it can be changed into another prime (405605047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202802973 + 202802974.

It is an arithmetic number, because the mean of its divisors is an integer number (202802974).

Almost surely, 2^405605947 is an apocalyptic number.

405605947 is a deficient number, since it is larger than the sum of its proper divisors (1).

405605947 is an equidigital number, since it uses as much as digits as its factorization.

405605947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 405605947 is about 20139.6610448140. The cubic root of 405605947 is about 740.2324245559.

The spelling of 405605947 in words is "four hundred five million, six hundred five thousand, nine hundred forty-seven".