1000640005 has 8 divisors (see below), whose sum is σ = 1208721024. Its totient is φ = 795210000.

The previous prime is 1000639999. The next prime is 1000640033. The reversal of 1000640005 is 5000460001.

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

It is not a de Polignac number, because 1000640005 - 2¹⁷ = 1000508933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661921 + ... + 663430.

It is an arithmetic number, because the mean of its divisors is an integer number (151090128).

Almost surely, 2^1000640005 is an apocalyptic number.

It is an amenable number.

1000640005 is a deficient number, since it is larger than the sum of its proper divisors (208081019).

1000640005 is a wasteful number, since it uses less digits than its factorization.

1000640005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325507.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1000640005 is about 31632.8943506597. The cubic root of 1000640005 is about 1000.2132895044.

The spelling of 1000640005 in words is "one billion, six hundred forty thousand, five".