1640473399 has 2 divisors, whose sum is σ = 1640473400. Its totient is φ = 1640473398.

The previous prime is 1640473343. The next prime is 1640473451. The reversal of 1640473399 is 9933740461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640473399 - 2⁷ = 1640473271 is a prime.

It is a super-2 number, since 2×1640473399² = 5382305945653226402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640473339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820236699 + 820236700.

It is an arithmetic number, because the mean of its divisors is an integer number (820236700).

Almost surely, 2^1640473399 is an apocalyptic number.

1640473399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640473399 is an equidigital number, since it uses as much as digits as its factorization.

1640473399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 46.

The square root of 1640473399 is about 40502.7579184430. The cubic root of 1640473399 is about 1179.3871659792.

The spelling of 1640473399 in words is "one billion, six hundred forty million, four hundred seventy-three thousand, three hundred ninety-nine".