899940005 has 4 divisors (see below), whose sum is σ = 1079928012. Its totient is φ = 719952000.

The previous prime is 899939987. The next prime is 899940043. The reversal of 899940005 is 500049998.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 324036001 + 575904004 = 18001^2 + 23998^2 .

It is not a de Polignac number, because 899940005 - 2⁶ = 899939941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89993996 + ... + 89994005.

It is an arithmetic number, because the mean of its divisors is an integer number (269982003).

Almost surely, 2^899940005 is an apocalyptic number.

It is an amenable number.

899940005 is a deficient number, since it is larger than the sum of its proper divisors (179988007).

899940005 is a wasteful number, since it uses less digits than its factorization.

899940005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179988006.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 899940005 is about 29999.0000666689. Note that the first 4 decimals coincide. The cubic root of 899940005 is about 965.4679305972.

The spelling of 899940005 in words is "eight hundred ninety-nine million, nine hundred forty thousand, five".