1986986943999 has 32 divisors (see below), whose sum is σ = 2992130366400. Its totient is φ = 1302860004480.

The previous prime is 1986986943947. The next prime is 1986986944003. The reversal of 1986986943999 is 9993496896891.

1986986943999 is a `hidden beast` number, since 1 + 9 + 8 + 6 + 9 + 86 + 9 + 439 + 99 = 666.

It is not a de Polignac number, because 1986986943999 - 2¹⁹ = 1986986419711 is a prime.

It is a super-2 number, since 2×1986986943999² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986986943299) 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, 36979597 + ... + 37033289.

It is an arithmetic number, because the mean of its divisors is an integer number (93504073950).

Almost surely, 2^{1986986943999} is an apocalyptic number.

1986986943999 is a deficient number, since it is larger than the sum of its proper divisors (1005143422401).

1986986943999 is a wasteful number, since it uses less digits than its factorization.

1986986943999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76232 (or 76226 counting only the distinct ones).

The product of its digits is 14693280768, while the sum is 90.

The spelling of 1986986943999 in words is "one trillion, nine hundred eighty-six billion, nine hundred eighty-six million, nine hundred forty-three thousand, nine hundred ninety-nine".