1640943307 has 2 divisors, whose sum is σ = 1640943308. Its totient is φ = 1640943306.

The previous prime is 1640943301. The next prime is 1640943389. The reversal of 1640943307 is 7033490461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1640943307 - 2⁷ = 1640943179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640943301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820471653 + 820471654.

It is an arithmetic number, because the mean of its divisors is an integer number (820471654).

Almost surely, 2^1640943307 is an apocalyptic number.

1640943307 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640943307 is an equidigital number, since it uses as much as digits as its factorization.

1640943307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 1640943307 is about 40508.5584413961. The cubic root of 1640943307 is about 1179.4997657032.

The spelling of 1640943307 in words is "one billion, six hundred forty million, nine hundred forty-three thousand, three hundred seven".