1986340081 has 8 divisors (see below), whose sum is σ = 2173165344. Its totient is φ = 1800556320.

The previous prime is 1986340043. The next prime is 1986340087. The reversal of 1986340081 is 1800436891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1986340081 - 2⁹ = 1986339569 is a prime.

It is a super-2 number, since 2×1986340081² = 7891093834774173122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1986340087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256380 + ... + 264013.

It is an arithmetic number, because the mean of its divisors is an integer number (271645668).

Almost surely, 2^1986340081 is an apocalyptic number.

1986340081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1986340081 is a deficient number, since it is larger than the sum of its proper divisors (186825263).

1986340081 is a wasteful number, since it uses less digits than its factorization.

1986340081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520751.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1986340081 is about 44568.3753462026. The cubic root of 1986340081 is about 1257.0460913952.

The spelling of 1986340081 in words is "one billion, nine hundred eighty-six million, three hundred forty thousand, eighty-one".