1987617842 has 32 divisors (see below), whose sum is σ = 3473971200. Its totient is φ = 835254288.

The previous prime is 1987617823. The next prime is 1987617869. The reversal of 1987617842 is 2487167891.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343223 + ... + 348965.

It is an arithmetic number, because the mean of its divisors is an integer number (108561600).

Almost surely, 2^1987617842 is an apocalyptic number.

1987617842 is a deficient number, since it is larger than the sum of its proper divisors (1486353358).

1987617842 is a wasteful number, since it uses less digits than its factorization.

1987617842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6230.

The product of its digits is 1354752, while the sum is 53.

The square root of 1987617842 is about 44582.7078809711. The cubic root of 1987617842 is about 1257.3155753235.

The spelling of 1987617842 in words is "one billion, nine hundred eighty-seven million, six hundred seventeen thousand, eight hundred forty-two".