1997800587 has 6 divisors (see below), whose sum is σ = 2885711972. Its totient is φ = 1331867052.

The previous prime is 1997800579. The next prime is 1997800639. The reversal of 1997800587 is 7850087991.

It is not a de Polignac number, because 1997800587 - 2³ = 1997800579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997800507) 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 5 ways as a sum of consecutive naturals, for example, 110988913 + ... + 110988930.

Almost surely, 2^1997800587 is an apocalyptic number.

1997800587 is a deficient number, since it is larger than the sum of its proper divisors (887911385).

1997800587 is a wasteful number, since it uses less digits than its factorization.

1997800587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221977849 (or 221977846 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 54.

The square root of 1997800587 is about 44696.7626008864. The cubic root of 1997800587 is about 1259.4590327030.

The spelling of 1997800587 in words is "one billion, nine hundred ninety-seven million, eight hundred thousand, five hundred eighty-seven".