1640317347 has 12 divisors (see below), whose sum is σ = 2391085840. Its totient is φ = 1083511728.

The previous prime is 1640317339. The next prime is 1640317363. The reversal of 1640317347 is 7437130461.

1640317347 is a `hidden beast` number, since 1 + 640 + 3 + 1 + 7 + 3 + 4 + 7 = 666.

It is not a de Polignac number, because 1640317347 - 2³ = 1640317339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640317397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 835063 + ... + 837024.

Almost surely, 2^1640317347 is an apocalyptic number.

1640317347 is a deficient number, since it is larger than the sum of its proper divisors (750768493).

1640317347 is a wasteful number, since it uses less digits than its factorization.

1640317347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672202 (or 1672199 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 1640317347 is about 40500.8314359101. The cubic root of 1640317347 is about 1179.3497679203.

The spelling of 1640317347 in words is "one billion, six hundred forty million, three hundred seventeen thousand, three hundred forty-seven".