1987606986 has 64 divisors (see below), whose sum is σ = 4505932800. Its totient is φ = 580697856.

The previous prime is 1987606963. The next prime is 1987606987. The reversal of 1987606986 is 6896067891.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1987606987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105651 + ... + 123033.

It is an arithmetic number, because the mean of its divisors is an integer number (70405200).

Almost surely, 2^1987606986 is an apocalyptic number.

1987606986 is an abundant number, since it is smaller than the sum of its proper divisors (2518325814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1987606986 is a wasteful number, since it uses less digits than its factorization.

1987606986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17483.

The product of its (nonzero) digits is 7838208, while the sum is 60.

The square root of 1987606986 is about 44582.5861295641. The cubic root of 1987606986 is about 1257.3132862445.

The spelling of 1987606986 in words is "one billion, nine hundred eighty-seven million, six hundred six thousand, nine hundred eighty-six".