405545530 has 32 divisors (see below), whose sum is σ = 807390864. Its totient is φ = 145691136.

The previous prime is 405545521. The next prime is 405545533. The reversal of 405545530 is 35545504.

It can be written as a sum of positive squares in 8 ways, for example, as 291419041 + 114126489 = 17071^2 + 10683^2 .

It is a junction number, because it is equal to n+sod(n) for n = 405545492 and 405545501.

It is not an unprimeable number, because it can be changed into a prime (405545533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37347 + ... + 46966.

Almost surely, 2^405545530 is an apocalyptic number.

405545530 is a deficient number, since it is larger than the sum of its proper divisors (401845334).

405545530 is a wasteful number, since it uses less digits than its factorization.

405545530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84370.

The product of its (nonzero) digits is 30000, while the sum is 31.

The square root of 405545530 is about 20138.1610381882. The cubic root of 405545530 is about 740.1956689779.

The spelling of 405545530 in words is "four hundred five million, five hundred forty-five thousand, five hundred thirty".