1640043005 has 8 divisors (see below), whose sum is σ = 2013820512. Its totient is φ = 1281521808.

The previous prime is 1640042983. The next prime is 1640043047. The reversal of 1640043005 is 5003400461.

It is a happy number.

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 1640043005 - 2¹⁴ = 1640026621 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, 3813839 + ... + 3814268.

It is an arithmetic number, because the mean of its divisors is an integer number (251727564).

Almost surely, 2^1640043005 is an apocalyptic number.

It is an amenable number.

1640043005 is a deficient number, since it is larger than the sum of its proper divisors (373777507).

1640043005 is an equidigital number, since it uses as much as digits as its factorization.

1640043005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7628155.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1640043005 is about 40497.4444255437. Note that the first 4 decimals coincide. The cubic root of 1640043005 is about 1179.2840157629.

Adding to 1640043005 its reverse (5003400461), we get a palindrome (6643443466).

The spelling of 1640043005 in words is "one billion, six hundred forty million, forty-three thousand, five".