1640830487 has 2 divisors, whose sum is σ = 1640830488. Its totient is φ = 1640830486.

The previous prime is 1640830441. The next prime is 1640830493. The reversal of 1640830487 is 7840380461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640830487 - 2²⁰ = 1639781911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640830687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820415243 + 820415244.

It is an arithmetic number, because the mean of its divisors is an integer number (820415244).

Almost surely, 2^1640830487 is an apocalyptic number.

1640830487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640830487 is an equidigital number, since it uses as much as digits as its factorization.

1640830487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 1640830487 is about 40507.1658722256. The cubic root of 1640830487 is about 1179.4727336474.

The spelling of 1640830487 in words is "one billion, six hundred forty million, eight hundred thirty thousand, four hundred eighty-seven".