405556057 has 2 divisors, whose sum is σ = 405556058. Its totient is φ = 405556056.

The previous prime is 405556049. The next prime is 405556061. The reversal of 405556057 is 750655504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 281434176 + 124121881 = 16776^2 + 11141^2 .

It is a cyclic number.

It is not a de Polignac number, because 405556057 - 2³ = 405556049 is a prime.

It is not a weakly prime, because it can be changed into another prime (405556087) 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, 202778028 + 202778029.

It is an arithmetic number, because the mean of its divisors is an integer number (202778029).

Almost surely, 2^405556057 is an apocalyptic number.

It is an amenable number.

405556057 is a deficient number, since it is larger than the sum of its proper divisors (1).

405556057 is an equidigital number, since it uses as much as digits as its factorization.

405556057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105000, while the sum is 37.

The square root of 405556057 is about 20138.4224059384. The cubic root of 405556057 is about 740.2020734970.

The spelling of 405556057 in words is "four hundred five million, five hundred fifty-six thousand, fifty-seven".