1721940587 has 2 divisors, whose sum is σ = 1721940588. Its totient is φ = 1721940586.

The previous prime is 1721940581. The next prime is 1721940611. The reversal of 1721940587 is 7850491271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1721940587 - 2¹⁸ = 1721678443 is a prime.

It is not a weakly prime, because it can be changed into another prime (1721940581) 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, 860970293 + 860970294.

It is an arithmetic number, because the mean of its divisors is an integer number (860970294).

Almost surely, 2^1721940587 is an apocalyptic number.

1721940587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721940587 is an equidigital number, since it uses as much as digits as its factorization.

1721940587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 44.

The square root of 1721940587 is about 41496.2719650814. The cubic root of 1721940587 is about 1198.5957153968.

The spelling of 1721940587 in words is "one billion, seven hundred twenty-one million, nine hundred forty thousand, five hundred eighty-seven".