999940505 has 8 divisors (see below), whose sum is σ = 1212299592. Its totient is φ = 791705088.

The previous prime is 999940481. The next prime is 999940517. The reversal of 999940505 is 505049999.

It can be written as a sum of positive squares in 4 ways, for example, as 16679056 + 983261449 = 4084^2 + 31357^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 999940505 - 2¹² = 999936409 is a prime.

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, 1030382 + ... + 1031351.

It is an arithmetic number, because the mean of its divisors is an integer number (151537449).

Almost surely, 2^999940505 is an apocalyptic number.

It is an amenable number.

999940505 is a deficient number, since it is larger than the sum of its proper divisors (212359087).

999940505 is a wasteful number, since it uses less digits than its factorization.

999940505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061835.

The product of its (nonzero) digits is 656100, while the sum is 50.

The square root of 999940505 is about 31621.8358891447. The cubic root of 999940505 is about 999.9801679400.

The spelling of 999940505 in words is "nine hundred ninety-nine million, nine hundred forty thousand, five hundred five".