1986969564 has 18 divisors (see below), whose sum is σ = 5022617600. Its totient is φ = 662323176.

The previous prime is 1986969559. The next prime is 1986969643. The reversal of 1986969564 is 4659696891.

1986969564 is a `hidden beast` number, since 1 + 9 + 8 + 6 + 9 + 69 + 564 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27596764 + ... + 27596835.

Almost surely, 2^1986969564 is an apocalyptic number.

It is an amenable number.

1986969564 is an abundant number, since it is smaller than the sum of its proper divisors (3035648036).

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

1986969564 is a wasteful number, since it uses less digits than its factorization.

1986969564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55193609 (or 55193604 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 63.

The square root of 1986969564 is about 44575.4367785667. The cubic root of 1986969564 is about 1257.1788658345.

The spelling of 1986969564 in words is "one billion, nine hundred eighty-six million, nine hundred sixty-nine thousand, five hundred sixty-four".