999405505 has 8 divisors (see below), whose sum is σ = 1370613312. Its totient is φ = 685306608.

The previous prime is 999405493. The next prime is 999405553. The reversal of 999405505 is 505504999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 999405505 - 2¹⁹ = 998881217 is a prime.

It is a super-2 number, since 2×999405505² = 1997622726848610050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14277187 + ... + 14277256.

It is an arithmetic number, because the mean of its divisors is an integer number (171326664).

Almost surely, 2^999405505 is an apocalyptic number.

It is an amenable number.

999405505 is a deficient number, since it is larger than the sum of its proper divisors (371207807).

999405505 is a wasteful number, since it uses less digits than its factorization.

999405505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28554455.

The product of its (nonzero) digits is 364500, while the sum is 46.

The square root of 999405505 is about 31613.3754129482. The cubic root of 999405505 is about 999.8017957177.

The spelling of 999405505 in words is "nine hundred ninety-nine million, four hundred five thousand, five hundred five".