1987156558 has 16 divisors (see below), whose sum is σ = 3066218784. Its totient is φ = 965170080.

The previous prime is 1987156487. The next prime is 1987156573. The reversal of 1987156558 is 8556517891.

It is a junction number, because it is equal to n+sod(n) for n = 1987156499 and 1987156508.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 25416 + ... + 67972.

It is an arithmetic number, because the mean of its divisors is an integer number (191638674).

Almost surely, 2^1987156558 is an apocalyptic number.

1987156558 is a deficient number, since it is larger than the sum of its proper divisors (1079062226).

1987156558 is a wasteful number, since it uses less digits than its factorization.

1987156558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43227.

The product of its digits is 3024000, while the sum is 55.

The square root of 1987156558 is about 44577.5342296992. The cubic root of 1987156558 is about 1257.2183023605.

The spelling of 1987156558 in words is "one billion, nine hundred eighty-seven million, one hundred fifty-six thousand, five hundred fifty-eight".